Fix CI failures across backend and frontend

[Bagirov24]

What changed

• fixed frontend TypeScript contracts, Axios refresh handling, task/project/notification types, theme wiring, and test isolation
• migrated ESLint to flat config, added the npm lockfile, aligned Vite/Vitest tooling, and switched CI to npm ci
• repaired the Alembic migration chain, PostgreSQL enum values, and JSONB defaults for fresh database creation
• fixed backend authentication, health checks, project pagination, comment validation, async test-loop isolation, and subtask project inheritance
• replaced vulnerable python-jose with PyJWT, upgraded vulnerable Python dependencies, and pinned compatible bcrypt/tooling versions
• repaired GitHub Actions coverage settings, Docker action pins, Compose validation environment, and Node/dependency cache configuration

Root cause

The open Dependabot PRs were blocked by baseline failures already present on main: stale frontend contracts and tooling, an invalid migration chain, test/runtime mismatches, vulnerable pinned dependencies, and broken Docker workflow configuration. This PR fixes that shared baseline so dependency updates can be rebased and evaluated normally.

Validation

• Backend lint, Ruff format, MyPy, and pip-audit: passed
• Backend integration suite: 85 tests passed; measured coverage 48.25%
• Frontend ESLint and TypeScript checks: passed
• Frontend unit tests: 7 passed
• Frontend production build: passed
• npm audit --audit-level=high: passed
• CodeQL for Python and JavaScript: passed
• Production Docker Compose validation: passed
• API and Web Docker image builds: passed
• Netlify deploy preview: passed

[netlify]

✅ Deploy Preview for luxury-halva-4d66d8 ready!

Name	Link
🔨 Latest commit	0c9fea4
🔍 Latest deploy log	https://app.netlify.com/projects/luxury-halva-4d66d8/deploys/6a6b01b0bd1759000861b38a
😎 Deploy Preview	https://deploy-preview-24--luxury-halva-4d66d8.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
🤖 Make changes	Run an agent on this branch

---

To edit notification comments on pull requests, go to your Netlify project configuration.