feat: add BDI core agent

Main BDI brain structure implemented. Still some TODOs left, and very
basic implementation (only one belief "user_said(Message)" and every
message is sent straight to a function which is responsible for getting
an LLM response.

ref: N25B-197

src/control_backend/core/config.py

@@ -1,15 +1,24 @@
+from re import L
 from pydantic import BaseModel
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 class ZMQSettings(BaseModel):
     internal_comm_address: str = "tcp://localhost:5560"
 
+class AgentSettings(BaseModel):
+    host: str = "localhost"
+    bdi_core_agent_name: str = "bdi_core"
+    belief_collector_agent_name: str = "belief_collector"
+    test_agent_name: str = "test_agent"
+
 class Settings(BaseSettings):
     app_title: str = "PepperPlus"
-    
+
     ui_url: str = "http://localhost:5173"
 
     zmq_settings: ZMQSettings = ZMQSettings()
+
+    agent_settings: AgentSettings = AgentSettings()
     
     model_config = SettingsConfigDict(env_file=".env")