style: auto-fix ESLint issues (curly braces and formatting)

- Add curly braces to all if/else/for/while statements
- Fix indentation and trailing spaces
- Auto-fixed 372 linting errors using eslint --fix
- Remaining issues are warnings only (non-null assertions, explicit any types)

src/gateway/server.ts

@@ -327,7 +327,7 @@ export class GatewayServer {
 
     if (uiDir) {
       const served = await serveStatic(req, res, uiDir);
-      if (served) return;
+      if (served) {return;}
     }
 
     // No UI directory configured, or file not found
@@ -344,7 +344,7 @@ export class GatewayServer {
     }
 
     // Inject connectionId into params so handlers can identify the client
-    if (!request.params) request.params = {};
+    if (!request.params) {request.params = {};}
     request.params.connectionId = connectionId;
 
     const send = (msg: OutboundMessage) => this.send(ws, msg);