feat(agent): complete closed-loop runtime and pricing fallback

backend/src/core/config/settings.py

@@ -140,6 +140,18 @@ class StorageSettings(BaseModel):
     retention_days: int = Field(default=30, ge=1, le=3650)
 
 
+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)
+    default_model_code: str = ""
+    streaming_enabled: bool = True
+
+
+class LlmSettings(BaseModel):
+    provider_keys: dict[str, str] = Field(default_factory=dict)
+
+
 class DatabaseSettings(BaseModel):
     host: str = "localhost"
     port: int = 5432
@@ -172,6 +184,8 @@ class Settings(BaseSettings):
     redis: RedisSettings = RedisSettings()
     supabase: SupabaseSettings = SupabaseSettings()
     storage: StorageSettings = StorageSettings()
+    llm: LlmSettings = LlmSettings()
+    agent_runtime: AgentRuntimeSettings = AgentRuntimeSettings()
     celery: CelerySettings = CelerySettings()
     database: DatabaseSettings = DatabaseSettings()