feat: 全面SSH中转代理 + mimo-v2.5-pro支持

- Yahoo Finance: 跳过本地限流，直接走SSH中转
- StockTwits: 直连403时自动fallback到SSH中转
- Reddit: 网络不可达时自动fallback到SSH中转
- Polymarket: 网络不可达时自动fallback到SSH中转
- FRED: 配置API Key (825283926dd016ea66e96cc919e047da)
- .env: 新增FRED_API_KEY和OPENAI_COMPATIBLE_API_KEY
- test_xiaomi.py: 小米mimo-v2.5-pro测试脚本

tradingagents/dataflows/polymarket.py

@@ -13,8 +13,12 @@ import json
 import logging
 from datetime import datetime, timezone
 
+import subprocess
+
 import requests
 
+from .stockstats_utils import _get_ssh_config
+
 logger = logging.getLogger(__name__)
 
 GAMMA_BASE = "https://gamma-api.polymarket.com"
@@ -27,11 +31,28 @@ DEFAULT_LIMIT = 6
 
 
 def _request(path: str, params: dict) -> dict:
-    response = requests.get(
-        f"{GAMMA_BASE}/{path}", params=params, timeout=REQUEST_TIMEOUT
-    )
-    response.raise_for_status()
-    return response.json()
+    url = f"{GAMMA_BASE}/{path}"
+    try:
+        response = requests.get(url, params=params, timeout=REQUEST_TIMEOUT)
+        response.raise_for_status()
+        return response.json()
+    except requests.RequestException:
+        # Fallback: fetch through SSH proxy
+        logger.info("Polymarket direct failed, trying SSH proxy for %s...", path)
+        query = "&".join(f"{k}={v}" for k, v in params.items())
+        full_url = f"{url}?{query}"
+        host, port, password = _get_ssh_config()
+        cmd = [
+            "sshpass", "-p", password,
+            "ssh", "-o", "StrictHostKeyChecking=no",
+            "-o", "ConnectTimeout=15",
+            "-p", str(port), f"root@{host}",
+            f'curl -s "{full_url}"'
+        ]
+        result = subprocess.run(cmd, capture_output=True, text=True, timeout=REQUEST_TIMEOUT)
+        if result.returncode != 0:
+            raise requests.RequestException(f"SSH proxy failed: {result.stderr}")
+        return json.loads(result.stdout)
 
 
 def _parse_json_list(value) -> list: