Configure ollama to use external host instead of docker service

- Update all ollama clients to use configurable OLLAMA_URL environment variable
- Remove ollama service from docker-compose.yml to use external ollama instance
- Configure docker-compose to connect to host ollama via 172.17.0.1:11434 (Linux) or host.docker.internal (macOS/Windows)
- Add cross-platform compatibility with extra_hosts mapping
- Update embedding function fallback URL for consistency

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

query.py

@@ -1,12 +1,16 @@
 import json
+import os
 from typing import Literal
 import datetime
-from ollama import chat, ChatResponse
+from ollama import chat, ChatResponse, Client
 
 from openai import OpenAI
 
 from pydantic import BaseModel, Field
 
+# Configure ollama client with URL from environment or default to localhost
+ollama_client = Client(host=os.getenv("OLLAMA_URL", "http://localhost:11434"))
+
 # This uses inferred filters — which means using LLM to create the metadata filters
 
 
@@ -109,7 +113,7 @@ class QueryGenerator:
         print(response)
         query = json.loads(response.output_parsed.extracted_metadata_fields)
 
-        # response: ChatResponse = chat(
+        # response: ChatResponse = ollama_client.chat(
             # model="gemma3n:e4b",
             # messages=[
                 # {"role": "system", "content": PROMPT},