Fix Dockerfile syntax version and Python compatibility

- Set Dockerfile syntax to version 1 as requested
- Use Python 3.11 from Debian Bookworm instead of 3.12
- Add comment explaining Bookworm ships with Python 3.11
- Python 3.11 meets project requirement of >=3.10
- Build tested successfully

mcp_server/docker/Dockerfile.falkordb-combined

@@ -1,13 +1,14 @@
-# syntax=docker/dockerfile:1.9
+# syntax=docker/dockerfile:1
 # Combined FalkorDB + Graphiti MCP Server Image
 # This extends the official FalkorDB image to include the MCP server
 
 FROM falkordb/falkordb:latest AS falkordb-base
 
 # Install Python and system dependencies
+# Note: Debian Bookworm (FalkorDB base) ships with Python 3.11
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    python3.12 \
-    python3.12-dev \
+    python3 \
+    python3-dev \
     python3-pip \
     curl \
     ca-certificates \