fix(.gitignore): anchor Python build artifacts; recover panel/src/lib (28 files)

The 'lib/' rule (intended for Python virtualenv at repo root) was matching panel/src/lib/, hiding the entire panel API client + utility tree from git. Anchored Python build-artifact rules to the repo root with a leading slash so they only match at the top level. Adds 28 panel/src/lib files that should have been tracked from day one.

panel/src/components/layout/connection-status.tsx

@@ -12,7 +12,7 @@ export function ConnectionStatus() {
   useEffect(() => {
     const checkConnection = async () => {
       try {
-        // Health endpoint is at /health (not under /api/v1)
+        // Health endpoint is at /health (not under /api)
         const response = await fetch("/health", {
           method: "GET",
           signal: AbortSignal.timeout(5000),

panel/src/components/settings/ai-routing-card.tsx

@@ -344,7 +344,7 @@ export function AIRoutingCard() {
           </div>
           {catalogOllamaOnly.length === 0 ? (
             <p className="text-xs text-muted-foreground">
-              Ollama catalog empty — check /api/v1/providers/catalog.
+              Ollama catalog empty — check /api/providers/catalog.
             </p>
           ) : null}
         </section>