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.

langgraph_service/Dockerfile

@@ -6,16 +6,22 @@ RUN apt-get update && apt-get install -y \
     g++ \
     && rm -rf /var/lib/apt/lists/*
 
-# Create app directory
+# Create directories
+RUN mkdir -p /app/packages /app/code
+
 WORKDIR /app
 
-# Copy requirements
+# Install packages to isolated directory
 COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install --target=/app/packages -r requirements.txt
 
 # Copy code
-COPY . .
+COPY . /app/code/
 
+ENV PYTHONPATH=/app/packages
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app/code
 EXPOSE 8090
 
 CMD ["python3", "-m", "uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8090"]