feat(03-01): add 8 Tier 4 Chinese providers (DeepSeek, Zhipu, Moonshot, Qwen, Baidu, ByteDance, 01.AI, MiniMax)

- DeepSeek, Moonshot, Qwen use documented sk- prefix patterns
- Zhipu, Baidu, ByteDance use keyword-only detection (no documented key format)
- All dual-located in providers/ and pkg/providers/definitions/

pkg/providers/definitions/moonshot.yaml

@@ -0,0 +1,22 @@
+format_version: 1
+name: moonshot
+display_name: Moonshot AI (Kimi)
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "moonshot"
+  - "MOONSHOT_API_KEY"
+  - "api.moonshot.cn"
+  - "kimi"
+  - "moonshot-v1"
+patterns:
+  - regex: 'sk-[A-Za-z0-9]{48}'
+    entropy_min: 4.0
+    confidence: medium
+verify:
+  method: GET
+  url: https://api.moonshot.cn/v1/models
+  headers:
+    Authorization: "Bearer {KEY}"
+  valid_status: [200]
+  invalid_status: [401, 403]