feat(s2a_service): Add pure API authorization mode without browser

- Add S2A_API_MODE configuration option to enable browser-less authorization
- Implement S2AApiAuthorizer class using curl_cffi for browser fingerprint simulation
- Add Sentinel PoW (Proof of Work) solver with FNV-1a hashing algorithm
- Implement OAuth flow via direct API calls instead of browser automation
- Add s2a_api_authorize() function to handle email/password authentication
- Support proxy configuration for API requests
- Add requirements token generation for API authentication
- Update browser_automation.py to check S2A_API_MODE and route to API or browser flow
- Update config.py to load S2A_API_MODE from configuration
- Add api_mode option to config.toml.example with documentation
- Improves performance and stability by eliminating browser overhead while maintaining compatibility with existing browser-based flow

browser_automation.py

@@ -17,6 +17,7 @@ from config import (
     BROWSER_HEADLESS,
     BROWSER_RANDOM_FINGERPRINT,
     AUTH_PROVIDER,
+    S2A_API_MODE,
     get_random_name,
     get_random_birthday,
     get_random_fingerprint
@@ -31,7 +32,8 @@ from cpa_service import (
 )
 from s2a_service import (
     s2a_generate_auth_url,
-    s2a_create_account_from_oauth
+    s2a_create_account_from_oauth,
+    s2a_api_authorize,
 )
 from logger import log
 
@@ -2939,14 +2941,21 @@ def perform_s2a_authorization(page, email: str, password: str) -> bool:
     """执行 S2A 授权流程 (密码登录)
 
     Args:
-        page: 浏览器实例
+        page: 浏览器实例 (API 模式下可为 None)
         email: 邮箱地址
         password: 密码
 
     Returns:
         bool: 授权是否成功
     """
-    log.info(f"开始 S2A 授权: {email}", icon="code")
+    # 检查是否使用 API 模式
+    if S2A_API_MODE:
+        log.info(f"使用 S2A API 模式授权: {email}", icon="code")
+        success, result = s2a_api_authorize(email, password)
+        return success
+    
+    # 以下是浏览器模式
+    log.info(f"开始 S2A 浏览器授权: {email}", icon="code")
     progress_update(phase="授权", step="开始 S2A 授权...")
 
     # 注意: 授权回调锁已在上层函数 (register_and_authorize/authorize_only) 中获取