📝 Add comprehensive README documentation for core modules and scripts

fastapi/dependencies/README.md

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+# FastAPI Dependencies
+
+This module contains the core dependency injection system for FastAPI applications.
+
+## Overview
+
+FastAPI's dependency injection system allows you to declare dependencies that will be automatically resolved and injected into your path operation functions. This provides a clean way to share code, database connections, enforce security, and more.
+
+## Module Contents
+
+### `models.py`
+Contains the core data models and classes used by the dependency injection system, including dependency resolution logic and parameter handling.
+
+### `utils.py`
+Utility functions for dependency resolution, parameter extraction, and dependency graph management.
+
+## Basic Usage
+
+```python
+from fastapi import FastAPI, Depends
+
+app = FastAPI()
+
+def common_parameters(q: str = None, skip: int = 0, limit: int = 100):
+    return {"q": q, "skip": skip, "limit": limit}
+
+@app.get("/items/")
+async def read_items(commons: dict = Depends(common_parameters)):
+    return commons
+```
+
+## Key Features
+
+- **Automatic Resolution**: Dependencies are automatically resolved based on type hints
+- **Nested Dependencies**: Dependencies can have their own dependencies
+- **Caching**: Dependencies can be cached to avoid repeated execution
+- **Security Integration**: Works seamlessly with FastAPI's security utilities
+- **Database Integration**: Perfect for database session management
+
+## Learn More
+
+For comprehensive tutorials and advanced usage patterns, see the [FastAPI Dependencies documentation](https://fastapi.tiangolo.com/tutorial/dependencies/).

fastapi/middleware/README.md

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+# FastAPI Middleware
+
+This module provides middleware components for FastAPI applications, built on top of Starlette's middleware system.
+
+## Overview
+
+Middleware in FastAPI allows you to add functionality that runs before and after each request. This module includes commonly used middleware for CORS, compression, security, and more.
+
+## Available Middleware
+
+### `cors.py`
+Cross-Origin Resource Sharing (CORS) middleware for handling cross-origin requests.
+
+```python
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+app = FastAPI()
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+```
+
+### `gzip.py`
+GZip compression middleware to automatically compress responses.
+
+```python
+from fastapi.middleware.gzip import GZipMiddleware
+
+app.add_middleware(GZipMiddleware, minimum_size=1000)
+```
+
+### `httpsredirect.py`
+HTTPS redirect middleware to automatically redirect HTTP requests to HTTPS.
+
+```python
+from fastapi.middleware.httpsredirect import HTTPSRedirectMiddleware
+
+app.add_middleware(HTTPSRedirectMiddleware)
+```
+
+### `trustedhost.py`
+Trusted host middleware to validate the Host header against a list of allowed hosts.
+
+```python
+from fastapi.middleware.trustedhost import TrustedHostMiddleware
+
+app.add_middleware(
+    TrustedHostMiddleware, 
+    allowed_hosts=["example.com", "*.example.com"]
+)
+```
+
+### `wsgi.py`
+WSGI middleware for mounting WSGI applications within FastAPI.
+
+```python
+from fastapi.middleware.wsgi import WSGIMiddleware
+from flask import Flask
+
+flask_app = Flask(__name__)
+app.mount("/flask", WSGIMiddleware(flask_app))
+```
+
+## Usage Pattern
+
+All middleware follows the same pattern:
+
+```python
+from fastapi import FastAPI
+from fastapi.middleware.{middleware_name} import {MiddlewareClass}
+
+app = FastAPI()
+app.add_middleware(MiddlewareClass, **options)
+```
+
+## Learn More
+
+For detailed configuration options and advanced usage, see the [FastAPI Middleware documentation](https://fastapi.tiangolo.com/tutorial/middleware/) and [Starlette Middleware documentation](https://www.starlette.io/middleware/).

fastapi/openapi/README.md

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+# FastAPI OpenAPI
+
+This module handles OpenAPI schema generation and documentation for FastAPI applications.
+
+## Overview
+
+FastAPI automatically generates OpenAPI schemas for your API, which power the interactive documentation (Swagger UI and ReDoc). This module contains the core functionality for schema generation, customization, and documentation rendering.
+
+## Module Contents
+
+### `constants.py`
+Contains constants used throughout the OpenAPI schema generation process, including HTTP status codes, content types, and schema definitions.
+
+### `docs.py`
+Handles the generation and serving of interactive API documentation (Swagger UI and ReDoc interfaces).
+
+### `models.py`
+Pydantic models that represent OpenAPI schema components, including operations, parameters, responses, and security definitions.
+
+### `utils.py`
+Utility functions for schema generation, including parameter extraction, response modeling, and schema merging.
+
+## Basic Customization
+
+```python
+from fastapi import FastAPI
+
+app = FastAPI(
+    title="My API",
+    description="A custom API with OpenAPI documentation",
+    version="1.0.0",
+    openapi_tags=[
+        {
+            "name": "items",
+            "description": "Operations with items",
+        }
+    ]
+)
+
+@app.get("/items/", tags=["items"])
+async def read_items():
+    return [{"item_id": "Foo"}]
+```
+
+## Advanced Schema Customization
+
+```python
+from fastapi.openapi.utils import get_openapi
+
+def custom_openapi():
+    if app.openapi_schema:
+        return app.openapi_schema
+    openapi_schema = get_openapi(
+        title="Custom API",
+        version="2.5.0",
+        description="This is a very custom OpenAPI schema",
+        routes=app.routes,
+    )
+    openapi_schema["info"]["x-logo"] = {
+        "url": "https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png"
+    }
+    app.openapi_schema = openapi_schema
+    return app.openapi_schema
+
+app.openapi = custom_openapi
+```
+
+## Key Features
+
+- **Automatic Schema Generation**: Schemas are generated from your Python type hints
+- **Interactive Documentation**: Swagger UI and ReDoc interfaces are automatically available
+- **Customizable**: Full control over OpenAPI schema generation and documentation
+- **Standards Compliant**: Generates valid OpenAPI 3.0+ schemas
+- **Security Integration**: Automatic security scheme documentation
+
+## Learn More
+
+For comprehensive guides on customizing OpenAPI schemas and documentation, see the [FastAPI OpenAPI documentation](https://fastapi.tiangolo.com/advanced/extending-openapi/).

fastapi/security/README.md

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+# FastAPI Security
+
+This module provides security utilities and authentication implementations for FastAPI applications.
+
+## Overview
+
+FastAPI's security module offers a comprehensive set of tools for implementing authentication and authorization in your APIs. It supports various authentication schemes including OAuth2, API keys, HTTP Basic/Bearer authentication, and more.
+
+## Security Components
+
+### `oauth2.py`
+OAuth2 authentication flows including Authorization Code, Client Credentials, and Password flows.
+
+```python
+from fastapi import FastAPI, Depends
+from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
+
+app = FastAPI()
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+
+@app.post("/token")
+async def login(form_data: OAuth2PasswordRequestForm = Depends()):
+    # Authenticate user and return token
+    return {"access_token": "fake-token", "token_type": "bearer"}
+
+@app.get("/users/me")
+async def read_users_me(token: str = Depends(oauth2_scheme)):
+    return {"token": token}
+```
+
+### `api_key.py`
+API key authentication for header, query parameter, or cookie-based authentication.
+
+```python
+from fastapi.security import APIKeyHeader
+
+api_key_header = APIKeyHeader(name="X-API-Key")
+
+@app.get("/protected")
+async def protected_route(api_key: str = Depends(api_key_header)):
+    return {"message": "Access granted"}
+```
+
+### `http.py`
+HTTP authentication schemes including Basic and Bearer authentication.
+
+```python
+from fastapi.security import HTTPBasic, HTTPBearer
+
+security_basic = HTTPBasic()
+security_bearer = HTTPBearer()
+
+@app.get("/basic")
+async def basic_auth(credentials: HTTPBasicCredentials = Depends(security_basic)):
+    return {"username": credentials.username}
+```
+
+### `open_id_connect_url.py`
+OpenID Connect authentication support for integration with identity providers.
+
+```python
+from fastapi.security import OpenIdConnect
+
+openid_connect = OpenIdConnect(openIdConnectUrl="/.well-known/openid_configuration")
+```
+
+### `base.py`
+Base classes and utilities for implementing custom security schemes.
+
+### `utils.py`
+Utility functions for security operations including token validation, password hashing, and security scheme helpers.
+
+## Common Patterns
+
+### JWT Token Authentication
+```python
+from fastapi import FastAPI, Depends, HTTPException, status
+from fastapi.security import HTTPBearer
+import jwt
+
+security = HTTPBearer()
+
+def verify_token(token: str = Depends(security)):
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        return payload
+    except jwt.PyJWTError:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid token"
+        )
+```
+
+### Role-Based Access Control
+```python
+def require_role(required_role: str):
+    def role_checker(current_user: dict = Depends(get_current_user)):
+        if current_user.get("role") != required_role:
+            raise HTTPException(status_code=403, detail="Insufficient permissions")
+        return current_user
+    return role_checker
+
+@app.get("/admin")
+async def admin_only(user: dict = Depends(require_role("admin"))):
+    return {"message": "Admin access granted"}
+```
+
+## Security Best Practices
+
+- Always use HTTPS in production
+- Implement proper token expiration and refresh mechanisms
+- Use strong, randomly generated secrets for signing tokens
+- Validate and sanitize all input data
+- Implement rate limiting to prevent abuse
+- Log security events for monitoring
+
+## Learn More
+
+For detailed tutorials and advanced security patterns, see the [FastAPI Security documentation](https://fastapi.tiangolo.com/tutorial/security/).