Fix backend-checks CI failure by removing merged duplicate backend code and restoring coherent app wiring

[Copilot]

backend-checks was failing at the Ruff stage due to duplicate symbols, mid-file imports, and undefined references introduced by conflicting/duplicated backend code blocks. This PR consolidates the affected modules to a single valid implementation and aligns main.py imports with the repository’s actual API layout.

• CI failure source cleanup (Ruff F811/E402/F401/F821)

  • Removed duplicate/redefined imports and functions in:
    • app/api/routes/auth.py
    • app/core/dependencies.py
    • app/core/security.py
    • app/main.py
    • app/observability/logging.py
    • app/reliability/rate_limit.py
    • app/db/init_db.py
    • app/db/models.py

• Application wiring corrections

  • Replaced non-existent app.api.v1.* router imports with existing app.api.routes.* modules in app/main.py.
  • Removed duplicated FastAPI app construction and duplicate /metrics handlers, leaving one consistent app definition.

• DB model registration cleanup

  • Kept model import side effects explicit in app/db/init_db.py while removing dead/unused imports that triggered lint errors.

# before (broken module path)
from app.api.v1.auth import router as auth_router

# after (matches repository structure)
from app.api.routes.auth import router as auth_router

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Project	Deployment	Actions	Updated (UTC)
enterprise-rag	Ready	Preview, Comment	Jul 9, 2026 10:03pm