feat(api): 接入微信登录并原生实现咨询域（ECR-049/050）

小程序可在 Go 上完成微信手机号登录、测评、预约和下单，不再反代 Java。

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/CONTRACT_DIFF/ECR-049.yaml

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+ecr: ECR-049
+capability: account-auth
+change:
+  type: additive
+breaking_change: false
+migration_required: true
+apis:
+  - method: POST
+    path: /api/v1/auth/wechat
+    change: added
+  - method: ANY
+    path: /api/app-api/*
+    change: added
+  - method: ANY
+    path: /api/admin-api/*
+    change: added
+migration: 000058_wechat_auth_gateway
+notes: H5 OpenLogin kept; miniprogram password login unused; Java remains until later ECR

docs/CONTRACT_DIFF/ECR-050.yaml

@@ -0,0 +1,18 @@
+ecr: ECR-050
+capability: consult-miniprogram
+change:
+  type: additive
+breaking_change: true
+migration_required: true
+apis:
+  - method: ANY
+    path: /api/v1/psychic/*
+    change: added
+  - method: POST
+    path: /api/v1/upload
+    change: added
+  - method: ANY
+    path: /api/app-api/*
+    change: removed
+migration: 000059_consult_native
+notes: miniprogram urls switched to /api/v1; Java proxy removed