fix: get LLM API key from DB instead of env var

- ai_proactive now reads API key from ai_providers table (like ai_assistant)
- Falls back to API_KEY_OLLAMA_CLOUD env var if no provider found
- Fixes: proactive engine could not generate suggestions because API key was empty

app/plugins/builtins/ai_proactive/jobs.py

@@ -187,23 +187,35 @@ async def deep_analysis(
 
         # Generate extended suggestion with deep analysis prompt
         model = settings.model or "ollama/deepseek-v4"
+
+        # Get API key from DB (like ai_assistant does) or fall back to env
+        from app.plugins.builtins.ai_proactive.services import _get_llm_api_key
+        api_key, api_base = await _get_llm_api_key(db, tid)
+        if not api_key:
+            api_key = os.environ.get('API_KEY_OLLAMA_CLOUD', '') or None
+
+        litellm_kwargs: dict[str, Any] = dict(
+            model=model,
+            messages=[
+                {"role": "system", "content": DEEP_SYSTEM_PROMPT},
+                {
+                    "role": "user",
+                    "content": json.dumps(
+                        extended_context, default=str, ensure_ascii=False
+                    ),
+                },
+            ],
+            temperature=0.3,
+            max_tokens=800,
+            response_format={"type": "json_object"},
+        )
+        if api_key:
+            litellm_kwargs["api_key"] = api_key
+        if api_base:
+            litellm_kwargs["api_base"] = api_base
+
         try:
-            response = await litellm.acompletion(
-                model=model,
-                messages=[
-                    {"role": "system", "content": DEEP_SYSTEM_PROMPT},
-                    {
-                        "role": "user",
-                        "content": json.dumps(
-                            extended_context, default=str, ensure_ascii=False
-                        ),
-                    },
-                ],
-                temperature=0.3,
-                max_tokens=800,
-                response_format={"type": "json_object"},
-                api_key=OLLAMA_API_KEY,
-            )
+            response = await litellm.acompletion(**litellm_kwargs)
             content = response.choices[0].message.content
             if not content:
                 return