refactor: comprehensive audit — fix bugs, harden security, deduplicate providers, add CI/Docker

Phase 1: Fix compilation (config_path Option<PathBuf>, streaming test, stale test cleanup)
Phase 2: Fix critical bugs (remove block_on deadlocks in 4 providers, fix broken SQL query builder)
Phase 3: Security hardening (session manager, real auth, token masking, Gemini key to header, password policy)
Phase 4: Implement stubs (real provider test, /proc health metrics, client/provider/backup endpoints, has_images)
Phase 5: Code quality (shared provider helpers, explicit re-exports, all Clippy warnings fixed, unwrap removal, 6 unused deps removed, dashboard split into 7 sub-modules)
Phase 6: Infrastructure (GitHub Actions CI, multi-stage Dockerfile, rustfmt.toml, clippy.toml, script fixes)

test_dashboard.sh

@@ -30,7 +30,7 @@ curl -s http://localhost:8080/api/auth/status | jq . 2>/dev/null || echo "JSON r
 
 echo ""
 echo "Dashboard should be available at: http://localhost:8080"
-echo "Default login: admin / admin123"
+echo "Default login: admin / admin"
 echo ""
 echo "Press Ctrl+C to stop the server"