feat: add OpencodeGo AI provider (deepseek-v4-flash) as primary, existing providers as fallback

backend/app/ai/providers/__init__.py

@@ -4,5 +4,6 @@ from .deepl import DeepLProvider
 from .local import LocalProvider
 from .spark import SparkProvider
 from .sensenova import SensenovaProvider
+from .opencode_go import OpencodeGoProvider
 
-__all__ = ["OpenAIProvider", "ClaudeProvider", "DeepLProvider", "LocalProvider", "SparkProvider", "SensenovaProvider"]
+__all__ = ["OpenAIProvider", "ClaudeProvider", "DeepLProvider", "LocalProvider", "SparkProvider", "SensenovaProvider", "OpencodeGoProvider"]

backend/app/ai/providers/opencode_go.py

@@ -0,0 +1,7 @@
+from app.ai.providers.openai import OpenAIProvider
+
+
+class OpencodeGoProvider(OpenAIProvider):
+    def __init__(self, api_key: str, model: str = "deepseek-v4-flash", base_url: str = "https://opencode.ai/zen/go/v1"):
+        super().__init__(api_key=api_key, model=model, base_url=base_url)
+        self._name = f"opencode-go-{model}"

backend/app/ai/router.py

@@ -1,6 +1,6 @@
 from typing import Dict, Any, Optional, List
 from app.ai.base import AIProvider
-from app.ai.providers import OpenAIProvider, ClaudeProvider, DeepLProvider, LocalProvider, SparkProvider, SensenovaProvider
+from app.ai.providers import OpenAIProvider, ClaudeProvider, DeepLProvider, LocalProvider, SparkProvider, SensenovaProvider, OpencodeGoProvider
 from app.config import settings
 from app.ai.trade_corpus import TradeCorpus
 import logging
@@ -34,6 +34,17 @@ class AIRouter:
             except Exception as e:
                 logger.warning(f"Sensenova init failed: {e}")
 
+        if settings.OPENCODE_GO_API_KEY:
+            try:
+                self.providers["opencode_go"] = OpencodeGoProvider(
+                    api_key=settings.OPENCODE_GO_API_KEY,
+                    model=settings.OPENCODE_GO_MODEL,
+                    base_url=settings.OPENCODE_GO_BASE_URL,
+                )
+                logger.info("OpencodeGo provider ready")
+            except Exception as e:
+                logger.warning(f"OpencodeGo init failed: {e}")
+
         if settings.ANTHROPIC_API_KEY:
             try:
                 self.providers["anthropic"] = ClaudeProvider(api_key=settings.ANTHROPIC_API_KEY)