feat(agent): add redis short-term user context cache and align tests

backend/src/core/config/settings.py

@@ -144,6 +144,9 @@ class AgentRuntimeSettings(BaseModel):
     redis_stream_prefix: str = "agent:events"
     redis_stream_read_count: int = Field(default=100, ge=1, le=1000)
     redis_stream_block_ms: int = Field(default=5000, ge=1, le=60000)
+    user_context_cache_prefix: str = "agent:user-context"
+    user_context_cache_ttl_seconds: int = Field(default=600, ge=60, le=86400)
+    user_context_cache_max_turns: int = Field(default=6, ge=1, le=100)
     default_model_code: str = ""
     streaming_enabled: bool = True
 

backend/src/core/config/static/database/llm_catalog.yaml

@@ -29,6 +29,6 @@ llms:
       factory_name: dashscope
       litellm_model: dashscope/qwen-turbo
 
-    - model_code: deepseek-v3.2
+    - model_code: deepseek-chat
       factory_name: deepseek
       litellm_model: deepseek/deepseek-chat

backend/src/core/config/static/database/system_agents.yaml

@@ -7,14 +7,14 @@ agents:
       max_tokens: null
     
   - agent_type: TASK_EXECUTION
-    llm_model_code: deepseek-v3.2
+    llm_model_code: deepseek-chat
     status: active
     config:
       temperature: 0.7
       max_tokens: null
     
   - agent_type: RESULT_REPORTING
-    llm_model_code: deepseek-v3.2
+    llm_model_code: deepseek-chat
     status: active
     config:
       temperature: 0.7