feat: Add Ollama Cloud integration with 20+ free AI models

- Added AI Model Manager to sidebar for quick model switching
- Integrated Ollama Cloud API with official models from ollama.com
- Added AISettingsModal with searchable model catalog
- Models include: GPT-OSS 120B, DeepSeek V3.2, Gemini 3 Pro, Qwen3 Coder, etc.
- Added 'Get Key' button linking to ollama.com/settings/keys
- Updated README with Ollama Cloud documentation and free API key instructions
- Fixed ChatPanel export issue
- Added Brain icon for reasoning models

bin/goose-ultra-final/electron/preload.js

@@ -91,5 +91,11 @@ contextBridge.exposeInMainWorld('electron', {
 
         // Browser
         openBrowser: (url) => ipcRenderer.invoke('vi-open-browser', { url })
+    },
+    // Ollama Cloud
+    ollama: {
+        getKeyStatus: () => ipcRenderer.invoke('ollama-get-key-status'),
+        saveKey: (key) => ipcRenderer.invoke('ollama-save-key', { key }),
+        getModels: () => ipcRenderer.invoke('ollama-get-models')
     }
 });