chore: codebase cleanup -- delete 1726 lines of dead code, scripts, and duplication

Deleted:
- 9 dev-only benchmark scripts (1589 lines) -- search quality
  experiments from v2/v3 sprint. In git history if needed.
- backend/.env.example (96 lines) -- duplicate of root, was out
  of sync. Root .env.example updated with 5 missing vars.
- config/api.py dead code (36 lines) -- LEGACY_API_PREFIX,
  DEPRECATION_HEADER, get_versioned_prefix(), get_legacy_prefix(),
  is_legacy_route(). None were imported anywhere.

Cleaned:
- routes/__init__.py: removed stale auth_router export that nobody
  imports (main.py imports directly from routes.auth).
- .gitignore: added .coverage, htmlcov/, .pytest_cache/.
- .env.example: added GITHUB_CLIENT_ID/SECRET, FRONTEND_URL,
  DISCORD_FEEDBACK_WEBHOOK, SENTRY_SEND_PII, SENTRY_INCLUDE_LOCAL_VARS.

Net: 14 files changed, -1726 lines.
284 tests pass.

Closes OPE-95, OPE-73

Author: DevanshuNEU

.env.example

@@ -27,6 +27,13 @@ SUPABASE_SERVICE_ROLE_KEY=eyJ...
 # Backend API
 API_KEY=change-this-secret-key-for-production
 BACKEND_API_URL=http://backend:8000
+FRONTEND_URL=http://localhost:3000
+
+# GitHub OAuth (Required for GitHub repo import)
+# Create OAuth App: https://github.com/settings/developers
+GITHUB_CLIENT_ID=
+GITHUB_CLIENT_SECRET=
+GITHUB_REDIRECT_URI=http://localhost:3000/auth/github/callback
 
 # CORS Configuration (Security)
 # Comma-separated list of allowed origins
@@ -39,10 +46,15 @@ REDIS_HOST=redis
 REDIS_PORT=6379
 
 # Sentry Error Tracking (Optional but recommended for production)
-# Get DSN from: https://sentry.io → Settings → Projects → Client Keys
+# Get DSN from: https://sentry.io -> Settings -> Projects -> Client Keys
 SENTRY_DSN=
+SENTRY_SEND_PII=false
+SENTRY_INCLUDE_LOCAL_VARS=false
 ENVIRONMENT=development  # development, staging, production
 
+# Discord Webhook (Optional - for feedback notifications)
+DISCORD_FEEDBACK_WEBHOOK=
+
 # Search V2 Configuration
 # Cohere API for reranking (Optional - improves search quality)
 # Get from: https://dashboard.cohere.com/api-keys

.gitignore

@@ -4,6 +4,11 @@ __pycache__/
 venv/
 env/
 
+# Test/coverage artifacts
+.coverage
+htmlcov/
+.pytest_cache/
+
 # Node
 node_modules/
 dist/

backend/.env.example

@@ -2,43 +2,7 @@
 API Configuration - Single Source of Truth for API Versioning
 
 Change API_VERSION here to update all routes across the application.
-Example: "v1" -> "v2" will change /api/v1/* to /api/v2/*
 """
 
-# API VERSION CONFIGURATION
-
 API_VERSION = "v1"
-
-# DERIVED PREFIXES (auto-calculated from version)
-
-# Current versioned API prefix: /api/v1
 API_PREFIX = f"/api/{API_VERSION}"
-
-# Legacy prefix for backward compatibility: /api
-# Routes here will be deprecated but still functional
-LEGACY_API_PREFIX = "/api"
-
-# DEPRECATION SETTINGS
-
-# When True, legacy routes (/api/*) will include deprecation warning headers
-LEGACY_DEPRECATION_ENABLED = True
-
-# Header to add on deprecated routes
-DEPRECATION_HEADER = "X-API-Deprecated"
-DEPRECATION_MESSAGE = f"This endpoint is deprecated. Please use {API_PREFIX} instead."
-
-# HELPER FUNCTIONS
-
-def get_versioned_prefix() -> str:
-    """Get the current versioned API prefix."""
-    return API_PREFIX
-
-
-def get_legacy_prefix() -> str:
-    """Get the legacy (deprecated) API prefix."""
-    return LEGACY_API_PREFIX
-
-
-def is_legacy_route(path: str) -> bool:
-    """Check if a route path is using the legacy prefix."""
-    return path.startswith(LEGACY_API_PREFIX) and not path.startswith(API_PREFIX)

backend/config/api.py

@@ -1,4 +1 @@
-"""API Routes package"""
-from .auth import router as auth_router
-
-__all__ = ["auth_router"]
+"""API Routes package."""