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/zhipu.yaml

@@ -0,0 +1,20 @@
+format_version: 1
+name: zhipu
+display_name: Zhipu AI (GLM)
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "zhipu"
+  - "ZHIPU_API_KEY"
+  - "ZHIPUAI_API_KEY"
+  - "bigmodel.cn"
+  - "open.bigmodel.cn"
+  - "glm-4"
+  - "chatglm"
+verify:
+  method: GET
+  url: https://open.bigmodel.cn/api/paas/v4/models
+  headers:
+    Authorization: "Bearer {KEY}"
+  valid_status: [200]
+  invalid_status: [401, 403]