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/mod.rs

@@ -198,9 +198,7 @@ impl TryFrom<ChatCompletionRequest> for UnifiedRequest {
             .into_iter()
             .map(|msg| {
                 let (content, _images_in_message) = match msg.content {
-                    MessageContent::Text { content } => {
-                        (vec![ContentPart::Text { text: content }], false)
-                    }
+                    MessageContent::Text { content } => (vec![ContentPart::Text { text: content }], false),
                     MessageContent::Parts { content } => {
                         let mut unified_content = Vec::new();
                         let mut has_images_in_msg = false;
@@ -213,18 +211,16 @@ impl TryFrom<ChatCompletionRequest> for UnifiedRequest {
                                 ContentPartValue::ImageUrl { image_url } => {
                                     has_images_in_msg = true;
                                     has_images = true;
-                                    unified_content.push(ContentPart::Image(
-                                        crate::multimodal::ImageInput::from_url(image_url.url)
-                                    ));
+                                    unified_content.push(ContentPart::Image(crate::multimodal::ImageInput::from_url(
+                                        image_url.url,
+                                    )));
                                 }
                             }
                         }
 
                         (unified_content, has_images_in_msg)
                     }
-                    MessageContent::None => {
-                        (vec![], false)
-                    }
+                    MessageContent::None => (vec![], false),
                 };
 
                 UnifiedMessage {