docs: add deployment configs, CI, and comprehensive documentation

[Emart29]

Motivation

• Provide ready-to-use deployment configuration for common hosts (Railway, Render, Vercel) so the project can be deployed without Docker.
• Improve onboarding and community contribution by adding a complete documentation set and GitHub templates.
• Add helper scripts for local development and test orchestration to standardize contributor workflows.

Description

• Added backend deployment files: backend/railway.json, backend/Procfile, backend/runtime.txt, and backend/render.yaml and updated startup commands to use src.iopsdata.api.main.
• Added frontend deployment/config: frontend/vercel.json and frontend/next.config.js (replacing next.config.ts) with image domains and environment validation.
• Added GitHub automation and community files: .github/workflows/ci.yml, issue templates in .github/ISSUE_TEMPLATE/, PULL_REQUEST_TEMPLATE.md, CODEOWNERS, and FUNDING.yml.
• Added a full documentation suite under docs/ (README.md, INSTALLATION.md, DEPLOYMENT.md, CONFIGURATION.md, ARCHITECTURE.md, API.md, CONTRIBUTING.md, CODE_OF_CONDUCT.md, SECURITY.md, CHANGELOG.md, ROADMAP.md, FAQ.md) plus updated root README.md, CONTRIBUTING.md, CODE_OF_CONDUCT.md, SECURITY.md, and consolidated .env.example, backend/.env.example, and frontend/.env.example samples.
• Added local helper scripts: scripts/dev.sh to run frontend + backend concurrently and scripts/test.sh to run backend pytest and linting and frontend checks, plus small fixes to scripts/setup.sh and scripts/setup.ps1 to point to the correct FastAPI entry module.

Testing

• No automated test runs were executed in this change because the patch is configuration and documentation focused.
• A CI workflow (.github/workflows/ci.yml) was added to run pytest for the backend, build the frontend (pnpm build), and run linting (ruff and eslint).
• Local helper scripts were added to make running tests and development (./scripts/test.sh, ./scripts/dev.sh) reproducible for contributors.

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Codex Task