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)

src/models/registry.rs

@@ -54,7 +54,7 @@ impl ModelRegistry {
                 return Some(model);
             }
         }
-        
+
         // Try searching for the model ID inside the metadata if the key was different
         for provider in self.providers.values() {
             for model in provider.models.values() {
@@ -63,7 +63,7 @@ impl ModelRegistry {
                 }
             }
         }
-        
+
         None
     }
 }