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/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>