feat: DeepSeek V4 Flash primario, Big Pickle fallback

- deepseek-v4-flash su opencode/go come modello primario
- big-pickle su opencode/zen come fallback (gratuito)
- Fallback automatico su censura "User Safety" o errore HTTP
- Aggiornati .env, config.py, start.sh, docker-compose.yml

src/engine/config.py

@@ -18,19 +18,23 @@ class ProviderConfig:
     local_base_url: str = "https://opencode.ai/zen/go/v1"
     local_api_key: str = ""
     local_model: str = "deepseek-v4-flash"
+    local_fallback_url: str = "https://opencode.ai/zen/v1"
+    local_fallback_model: str = "big-pickle"
     timeout: int = 120
 
 
 def load_from_env() -> ProviderConfig:
     return ProviderConfig(
-        kind=os.getenv("DCC_LLM_PROVIDER", "openrouter"),  # type: ignore
+        kind=os.getenv("DCC_LLM_PROVIDER", "local"),  # type: ignore
         ollama_base_url=os.getenv("DCC_OLLAMA_URL", "http://192.168.0.50:11434"),
         ollama_model=os.getenv("DCC_OLLAMA_MODEL", "gemma2:9b"),
         openrouter_api_key=os.getenv("DCC_OPENROUTER_KEY", os.getenv("OPENROUTER_API_KEY", "")),
         openrouter_model=os.getenv("DCC_OPENROUTER_MODEL", "openrouter/free"),
         openrouter_free_fallback=os.getenv("DCC_OR_FREE_FALLBACK", "1") == "1",
-        local_base_url=os.getenv("DCC_LOCAL_URL", "http://192.168.0.240/v1"),
+        local_base_url=os.getenv("DCC_LOCAL_URL", "https://opencode.ai/zen/v1"),
         local_api_key=os.getenv("DCC_LOCAL_KEY", ""),
         local_model=os.getenv("DCC_LOCAL_MODEL", "big-pickle"),
-        timeout=int(os.getenv("DCC_LLM_TIMEOUT", "60")),
+        local_fallback_url=os.getenv("DCC_LOCAL_FALLBACK_URL", "https://opencode.ai/zen/go/v1"),
+        local_fallback_model=os.getenv("DCC_LOCAL_FALLBACK_MODEL", "deepseek-v4-flash"),
+        timeout=int(os.getenv("DCC_LLM_TIMEOUT", "120")),
     )