refactor: 平台改为代码内置 provider 架构，一次性迁移现有数据 - 新增 app/providers：BalanceProvider 基类 + DeepSeek 适配器 + 注册表 - platforms 表去除 method/url/headers/body/balance_path，新增 provider_id - 现有数据库已一次性迁移（备份 data/monitor.db.bak-v1），不保留迁移工具 - 平台 UI 改为选择内置提供方；fetcher/monitor 走 provider 构建请求与解析 - 表达式引擎（运算符/函数）随架构保留，供 provider 内部使用 - 测试更新至 provider 模式，共 92 个

app/api.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import base64
-import json
 import logging
 import secrets
 import sqlite3
@@ -27,6 +26,7 @@ from app.models import (
     SettingsUpdate,
 )
 from app.monitor import Monitor
+from app.providers import get_provider, list_providers as list_providers_svc
 
 logger = logging.getLogger("monitor.api")
 
@@ -130,36 +130,40 @@ def create_app(cfg: Config | None = None) -> FastAPI:
 
     # ---------- 平台 ----------
 
+    @app.get("/api/providers", dependencies=[Depends(require_auth)])
+    def list_providers():
+        """代码内置的平台适配器列表（新增平台 = 代码扩展）。"""
+        return list_providers_svc()
+
     @app.get("/api/platforms", dependencies=[Depends(require_auth)])
     def list_platforms():
         with db.get_conn() as conn:
             rows = conn.execute(
-                """SELECT p.*, (SELECT COUNT(*) FROM accounts a WHERE a.platform_id = p.id) AS account_count
+                """SELECT p.id, p.name, p.currency, p.icon, p.provider_id,
+                          p.interval_seconds, p.retry_count, p.timeout_seconds,
+                          p.enabled, p.note, p.created_at, p.updated_at,
+                          (SELECT COUNT(*) FROM accounts a WHERE a.platform_id = p.id) AS account_count
                    FROM platforms p ORDER BY p.id"""
             ).fetchall()
-        result = []
-        for r in rows:
-            d = dict(r)
-            try:
-                d["headers"] = json.loads(d["headers"]) if d["headers"] else {}
-            except (ValueError, TypeError):
-                d["headers"] = {}
-            result.append(d)
-        return result
+        return [dict(r) for r in rows]
 
     @app.post("/api/platforms", dependencies=[Depends(require_auth)])
     def create_platform(body: PlatformCreate):
+        provider = get_provider(body.provider_id)
+        if provider is None:
+            raise HTTPException(status_code=400, detail=f"不支持的平台提供方: {body.provider_id}")
+        currency = body.currency or provider.currency
+        icon = body.icon or provider.icon
         try:
             with db.get_conn() as conn:
                 cur = conn.execute(
-                    """INSERT INTO platforms (name, currency, icon, method, url, headers, body,
-                       balance_path, interval_seconds, retry_count, timeout_seconds, enabled, note)
-                       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
+                    """INSERT INTO platforms (provider_id, name, currency, icon,
+                       interval_seconds, retry_count, timeout_seconds, enabled, note)
+                       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)""",
                     (
-                        body.name, body.currency, body.icon, body.method, body.url,
-                        __import__("json").dumps(body.headers, ensure_ascii=False),
-                        body.body, body.balance_path, body.interval_seconds,
-                        body.retry_count, body.timeout_seconds, int(body.enabled), body.note,
+                        body.provider_id, body.name, currency, icon,
+                        body.interval_seconds, body.retry_count, body.timeout_seconds,
+                        int(body.enabled), body.note,
                     ),
                 )
                 pid = cur.lastrowid
@@ -172,22 +176,22 @@ def create_app(cfg: Config | None = None) -> FastAPI:
     @app.put("/api/platforms/{pid}", dependencies=[Depends(require_auth)])
     def update_platform(pid: int, body: PlatformUpdate):
         fields = {}
+        if body.provider_id is not None:
+            provider = get_provider(body.provider_id)
+            if provider is None:
+                raise HTTPException(status_code=400, detail=f"不支持的平台提供方: {body.provider_id}")
+            fields["provider_id"] = body.provider_id
+            # 换 provider 时若未显式给货币/图标，则重置为 provider 默认
+            if "currency" not in body.model_fields_set:
+                fields["currency"] = provider.currency
+            if "icon" not in body.model_fields_set:
+                fields["icon"] = provider.icon
         if body.name is not None:
             fields["name"] = body.name
         if body.currency is not None:
             fields["currency"] = body.currency
         if body.icon is not None:
             fields["icon"] = body.icon
-        if body.method is not None:
-            fields["method"] = body.method
-        if body.url is not None:
-            fields["url"] = body.url
-        if body.headers is not None:
-            fields["headers"] = __import__("json").dumps(body.headers, ensure_ascii=False)
-        if body.body is not None:
-            fields["body"] = body.body
-        if body.balance_path is not None:
-            fields["balance_path"] = body.balance_path
         if body.interval_seconds is not None:
             fields["interval_seconds"] = body.interval_seconds
         if body.retry_count is not None: