…onfig CTA in chat panel

- completionProvider.ts: restore InsertAsSnippet for query language command
  completions (ESQL/SQL/EQL/PPL) — matches origin 1f914c9 and aligns with
  PR #416 fix; ultimate had re-introduced the None regression
- chat-panel.vue: restore 'Configure GPT' settings CTA button in error
  banner when AI is not configured, matching origin chatbot-box behavior;
  add useRouter import and error-settings-btn CSS

…dio view (#431)

## Summary

Syncs AI/agent improvements from the private `ultimate` branch into the
public repo.

### What's included

**Rust agent backend** (`src-tauri/src/agent/`)
- Multi-provider LLM agent with loop runner, tool executor, session
store (SQLite via rusqlite)
- Supports OpenAI, DeepSeek, OpenRouter, Ollama, LM Studio
- Replaces the old `openai_client` module (removed)
- New Tauri commands: `start_agent_session`, `send_agent_message`,
`validate_llm_config`, `list_llm_models`, etc.

**Data Studio view** (`src/views/data-studio/`)
- Full chat-driven data exploration interface
- Session history, tool confirmation cards, source management modals

**Agent composables & stores**
- `useAgentContext`, `useChatAgent`, `useSidebarChatAgent`,
`useDataStudioAgent`, `useDataStudioChatAgent`
- `dataStudioStore`, `codeActionStore`
- `appStore`: `ProviderConfig`, `ModelRef`, `getResolvedFeatureModel`
for multi-provider support; migrates legacy `aiConfigs` secret to new
`LlmSettings` on first load

**Shared agent UI components**
- `agent-message-bubble`, `chat-panel` (with missing-AI-config CTA),
`model-picker`

**AI settings** (`src/views/setting/components/aigc.vue`)
- Replaced per-provider tabs (OpenAI / DeepSeek) with unified
multi-provider settings
- Supports all five providers: OpenAI, DeepSeek, OpenRouter, Ollama, LM
Studio
- System prompt is now dynamically built from live database schema
context (richer than the static user-editable prompt in origin)

**Accessibility & UX improvements**
- `SearchableSelect`: full keyboard navigation (arrow keys, Enter,
Escape, ARIA)
- `path-breadcrumb`, `tool-bar-right`: keyboard + ARIA accessibility
- `DialogContent`: pointer-events fix for closed overlay
- Monaco `completionProvider`: `InsertAsSnippet` for query language
commands (ESQL/SQL/EQL/PPL) — aligns with #416
- Sidebar chat `chatbot-box`: resizable panel, session history, upgraded
to agent-based architecture

**i18n**: agent/data-studio keys added to `enUS` and `zhCN`

**MongoDB: always visible**
- Removed `VITE_FEATURE_MONGODB` feature flag and `__MONGODB_ENABLED__`
Vite define
- MongoDB is now shown in all environments (dev and production)
- `featureFlags.ts` retained for compatibility but no longer gates
MongoDB

### What's excluded
- All login/auth/Geekfun account features
- `authService.ts`, login views, `orContinueWith`/`loginWithGeekfun`
i18n keys

### What's preserved from origin
- Full MongoDB support (`mongo_client.rs`, `mongoApi.ts`, mongo editor)
- All DynamoDB extended features
(delete/truncate/update-table-config/pitr/streams/ttl modules)
- Origin's `connectionStore.ts` (has OpenSearch, EasySearch, MongoDB
types — ahead of ultimate)
- Origin's `fetch_client.rs` (OnceLock-based, safer than ultimate's
static mut version)
- `featureFlags.ts` + its tests (no longer gates MongoDB, but preserved)
- All keyboard accessibility and OpenSearch/EasySearch guards in
import/export views

### Verification
- `tsc --noEmit` ✅
- `eslint` ✅ (0 errors)
- `jest` ✅ 31 suites / 1280 tests

---------

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>