feat(03-01): add 8 Tier 4 providers (Baichuan, StepFun, SenseTime, iFlytek, Tencent, SiliconFlow, 360AI, Kuaishou)

- SiliconFlow uses documented sk- prefix
- Other 7 keyword-only (no documented key format, avoids false positives)
- Completes PROV-04: 16 Tier 4 Chinese/regional providers

pkg/providers/definitions/360ai.yaml

@@ -0,0 +1,17 @@
+format_version: 1
+name: 360ai
+display_name: 360 AI Brain
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "360gpt"
+  - "QIHOO_API_KEY"
+  - "api.360.cn"
+  - "ai.360.com"
+  - "360-ai"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []

pkg/providers/definitions/baichuan.yaml

@@ -0,0 +1,18 @@
+format_version: 1
+name: baichuan
+display_name: Baichuan AI
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "baichuan"
+  - "BAICHUAN_API_KEY"
+  - "api.baichuan-ai.com"
+  - "baichuan2"
+  - "baichuan-turbo"
+verify:
+  method: GET
+  url: https://api.baichuan-ai.com/v1/chat/completions
+  headers:
+    Authorization: "Bearer {KEY}"
+  valid_status: [200, 400]
+  invalid_status: [401, 403]

pkg/providers/definitions/iflytek.yaml

@@ -0,0 +1,19 @@
+format_version: 1
+name: iflytek
+display_name: iFlytek Spark (讯飞星火)
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "iflytek"
+  - "xf_yun"
+  - "spark_desk"
+  - "XFYUN_API_KEY"
+  - "XFYUN_API_SECRET"
+  - "XFYUN_APPID"
+  - "spark-api.xf-yun.com"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []

pkg/providers/definitions/kuaishou.yaml

@@ -0,0 +1,17 @@
+format_version: 1
+name: kuaishou
+display_name: Kuaishou KwaiYii
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "kuaishou"
+  - "kwaiyii"
+  - "KUAISHOU_API_KEY"
+  - "KWAI_API_KEY"
+  - "kwai-ai"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []

pkg/providers/definitions/sensetime.yaml

@@ -0,0 +1,17 @@
+format_version: 1
+name: sensetime
+display_name: SenseTime SenseNova
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "sensetime"
+  - "sensenova"
+  - "SENSETIME_API_KEY"
+  - "SENSENOVA_API_KEY"
+  - "api.sensenova.cn"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []

pkg/providers/definitions/siliconflow.yaml

@@ -0,0 +1,21 @@
+format_version: 1
+name: siliconflow
+display_name: SiliconFlow
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "siliconflow"
+  - "SILICONFLOW_API_KEY"
+  - "api.siliconflow.cn"
+  - "siliconflow.cn"
+patterns:
+  - regex: 'sk-[a-z]{20,}'
+    entropy_min: 3.5
+    confidence: low
+verify:
+  method: GET
+  url: https://api.siliconflow.cn/v1/models
+  headers:
+    Authorization: "Bearer {KEY}"
+  valid_status: [200]
+  invalid_status: [401, 403]

pkg/providers/definitions/stepfun.yaml

@@ -0,0 +1,18 @@
+format_version: 1
+name: stepfun
+display_name: StepFun (阶跃星辰)
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "stepfun"
+  - "STEP_API_KEY"
+  - "STEPFUN_API_KEY"
+  - "api.stepfun.com"
+  - "step-1v"
+verify:
+  method: GET
+  url: https://api.stepfun.com/v1/models
+  headers:
+    Authorization: "Bearer {KEY}"
+  valid_status: [200]
+  invalid_status: [401, 403]

pkg/providers/definitions/tencent.yaml

@@ -0,0 +1,17 @@
+format_version: 1
+name: tencent
+display_name: Tencent Hunyuan
+tier: 4
+last_verified: "2026-04-05"
+keywords:
+  - "hunyuan"
+  - "TENCENTCLOUD_SECRET_ID"
+  - "TENCENTCLOUD_SECRET_KEY"
+  - "hunyuan.tencentcloudapi.com"
+  - "tencent-hunyuan"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []