release: bump version to 0.51.0

docs/technical/en/frontend-admin-frontend-context.md

@@ -32,7 +32,7 @@ Current admin-related routes:
 - `/alerts/bgp`
 - `/alerts/situational`
 - `/bgp`
-- `/playground`
+- `/ai`
 - `/settings`
 
 `/earth` is a standalone display page and is not part of the console shell.
@@ -196,7 +196,24 @@ Responsibilities:
 
 `App.tsx` uses it to decide whether to redirect to the login page. `/docs` remains a public route, but the backend decides the visible catalog and content from the token; anonymous visitors only receive public docs.
 
-### 2. Business Data Gateway
+### 2. AI
+
+File:
+
+- [AISettings.tsx](/home/ray/dev/linkong/planet/frontend/src/pages/AISettings/AISettings.tsx)
+
+Responsibilities:
+
+- `/ai` now owns LLM Provider, AI Tool configuration, and the testbench instead of nesting them under `/settings`
+- The `模型供应商` tab manages default provider, model, base URL, provider key, local `aiprovider` proxy, and connection test
+- The `工具` tab manages WebSearch provider, search key, base URL, timeout, result count, and advanced provider options
+- The `测试台` tab embeds the former Playground real session, preset prompts, and AI Provider status debugging
+- The page reuses the Settings single-screen tabs, panel card, and internal scrolling style
+
+Legacy `/settings?tab=ai` should redirect to `/ai?tab=providers`.
+Legacy `/playground` should redirect to `/ai?tab=playground`.
+
+### 3. Business Data Gateway
 
 AI / situational awareness related services are currently in: