Fix CORS issues: Add logging middleware and relax origin regex

[KnellBalm]

Resolved a reported CORS issue where the backend was allegedly stripping Access-Control-Allow-Origin headers.
Since local reproduction showed correct behavior, I added CORSLoggingMiddleware to the backend to log Origin headers and response headers in production, enabling better diagnosis.
I also updated the CORS regex to be slightly more permissive (allowing HTTP) to rule out protocol mismatches.
Verified with new and existing tests.

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PR created automatically by Jules for task 3287224115208316547 started by @KnellBalm

Summary by Sourcery

Add CORS logging middleware and relax allowed origin patterns to aid debugging of reported CORS issues.

New Features:

• Introduce CORSLoggingMiddleware to record request origins and corresponding CORS response headers for debugging.

Enhancements:

• Broaden the CORS origin regex to accept both HTTP and HTTPS Cloud Run frontend domains.
• Apply the new CORS logging middleware globally so CORS behavior can be inspected in all environments.

Tests:

• Add tests verifying that the CORS logging middleware records logs when an Origin header is present and remains silent when it is absent.

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[sourcery-ai]

Reviewer's Guide

Adds a CORS-specific logging middleware to trace origins and response headers, relaxes the CORS origin regex to allow both HTTP and HTTPS Cloud Run frontend URLs, wires the middleware into the FastAPI app, and introduces tests to validate logging behavior without requiring real DB/scheduler dependencies.

Sequence diagram for request flow with CORSLoggingMiddleware and CORSMiddleware

sequenceDiagram
  actor Browser
  participant BackendApp
  participant CORSLoggingMiddleware
  participant CORSMiddleware
  participant Endpoint

  Browser->>BackendApp: HTTP request with Origin header
  BackendApp->>CORSLoggingMiddleware: dispatch(request, call_next)
  CORSLoggingMiddleware->>CORSLoggingMiddleware: log CORS Request Origin
  CORSLoggingMiddleware->>CORSMiddleware: call_next(request)
  CORSMiddleware->>Endpoint: call_next(request)
  Endpoint-->>CORSMiddleware: Response
  CORSMiddleware->>CORSMiddleware: apply CORS rules using cloud_origin_regex
  CORSMiddleware-->>CORSLoggingMiddleware: Response with access-control-allow-origin
  CORSLoggingMiddleware->>CORSLoggingMiddleware: log CORS Response headers and status
  CORSLoggingMiddleware-->>BackendApp: Response
  BackendApp-->>Browser: HTTP response with CORS headers

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Class diagram for new CORSLoggingMiddleware integration

classDiagram

class BaseHTTPMiddleware {
  +dispatch(request, call_next)
}

class CORSLoggingMiddleware {
  +dispatch(request, call_next)
}

class CORSMiddleware {
  +__init__(allow_origins, allow_origin_regex, allow_credentials, allow_methods, allow_headers)
  +dispatch(request, call_next)
}

class FastAPIApp {
  +add_middleware(middleware_class)
}

CORSLoggingMiddleware --|> BaseHTTPMiddleware
CORSMiddleware --|> BaseHTTPMiddleware
FastAPIApp ..> CORSMiddleware : uses
FastAPIApp ..> CORSLoggingMiddleware : uses

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File-Level Changes

Change	Details	Files
Introduce CORSLoggingMiddleware to trace CORS request/response details.	Add CORSLoggingMiddleware class extending BaseHTTPMiddleware that logs request Origin, path, and method when an Origin header is present. Log the corresponding Access-Control-Allow-Origin response header and status code for requests with an Origin header. Ensure middleware is a no-op for requests lacking an Origin header.	backend/common/middleware.py
Wire CORS logging into the FastAPI app and relax allowed Cloud Run origins.	Broaden cloud_origin_regex from HTTPS-only to allow both HTTP and HTTPS for query-craft-frontend*.run.app. Register CORSMiddleware as before and then add CORSLoggingMiddleware globally after CORS configuration so it can observe final headers. Maintain existing production vs. non-production origin whitelisting behavior while adding logging on all environments.	backend/main.py
Add tests to validate CORS logging middleware behavior and isolate app from real infrastructure.	Create pytest tests using TestClient to assert that CORSLoggingMiddleware logs both request origin and response headers when Origin is present and allowed. Verify that no CORS logging occurs when the Origin header is absent. Mock environment variables and critical modules (db_init, scheduler) so importing backend.main in tests does not trigger real DB connections or background threads.	tests/test_cors_logging.py

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[sourcery-ai]

Hey - I've left some high level feedback:

• In CORSLoggingMiddleware, you're calling get_logger on every request; consider instantiating the logger once at module or class level to avoid per-request logger lookup overhead.
• The CORS logging tests manipulate sys.path, environment variables, and sys.modules at import time; it would be more robust to move this setup into pytest fixtures (and cleanly restore env/module state) rather than mutating global process state in the test module body.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `CORSLoggingMiddleware`, you're calling `get_logger` on every request; consider instantiating the logger once at module or class level to avoid per-request logger lookup overhead.
- The CORS logging tests manipulate `sys.path`, environment variables, and `sys.modules` at import time; it would be more robust to move this setup into pytest fixtures (and cleanly restore env/module state) rather than mutating global process state in the test module body.

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