Restructure: Move services from root to unified repo

Moved updated services from /home/sam/development/ root into aboutme_chat_demo/:
- knowledge_service/ (with ChromaDB, gitea_scraper, FastAPI)
- langgraph_service/ (with LangGraph agent orchestration)
- airflow/ (with DAGs for scheduled ingestion)

All services now in single repo location.
Modular docker-compose files per service maintained.
Removed duplicate nested directories.
Updated files reflect latest working versions.

airflow/dags/gitea_ingestion_dag.py

@@ -5,10 +5,8 @@ Runs daily to fetch new/updated repos and ingest into ChromaDB.
 from datetime import datetime, timedelta
 from airflow import DAG
 from airflow.operators.python import PythonOperator
-from airflow.providers.http.operators.http import SimpleHttpOperator
 import os
 import sys
-import json
 
 # Add knowledge_service to path for imports
 sys.path.insert(0, '/opt/airflow/dags/repo')
@@ -115,30 +113,26 @@ with DAG(
     'gitea_daily_ingestion',
     default_args=default_args,
     description='Daily ingestion of Gitea repositories into knowledge base',
-    schedule_interval=timedelta(days=1),  # Run daily
+    schedule_interval=timedelta(days=1),
     start_date=datetime(2024, 1, 1),
     catchup=False,
     tags=['gitea', 'ingestion', 'knowledge'],
 ) as dag:
     
-    # Task 1: Fetch repository list
     fetch_repos_task = PythonOperator(
         task_id='fetch_repos',
         python_callable=fetch_gitea_repos,
     )
     
-    # Task 2: Fetch README content
     fetch_readmes_task = PythonOperator(
         task_id='fetch_readmes',
         python_callable=fetch_readmes,
     )
     
-    # Task 3: Ingest into ChromaDB
     ingest_task = PythonOperator(
         task_id='ingest_to_chroma',
         python_callable=ingest_to_chroma,
     )
     
-    # Define task dependencies
     fetch_repos_task >> fetch_readmes_task >> ingest_task