Fix Ollama: remove duplicate stale configMap in AIChatPanel

AIChatPanel had its own hardcoded configMap with the old llama-server
URL (localhost:8080) and field names (local_model_path). Every chat
message reconfigured the provider with these wrong values, overriding
the correct settings applied at startup.

Fix: replace the duplicate with a call to the shared configureAIProvider().
Also strip trailing slashes from ollama_url before appending /v1 to
prevent double-slash URLs (http://localhost:11434//v1).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/stores/settings.ts

@@ -57,7 +57,7 @@ export async function configureAIProvider(s: AppSettings): Promise<void> {
     openai: { api_key: s.openai_api_key, model: s.openai_model },
     anthropic: { api_key: s.anthropic_api_key, model: s.anthropic_model },
     litellm: { api_key: s.litellm_api_key, api_base: s.litellm_api_base, model: s.litellm_model },
-    local: { model: s.ollama_model, base_url: s.ollama_url + '/v1' },
+    local: { model: s.ollama_model, base_url: s.ollama_url.replace(/\/+$/, '') + '/v1' },
   };
   const config = configMap[s.ai_provider];
   if (config) {