fix(config): use docker hostnames for tatlock and searxng defaults

The homelab is retiring *.schweitz.internal and will rebind host ports
to 127.0.0.1, so container-to-container traffic must use container
names on the docker-dataplane network. Switch defaults from host
IP:port to http://tatlock:8000 and http://searxng:8080 (SearXNG's
internal port is 8080; 8087 is only the host-published port).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

webber-api/src/shared/config.py

@@ -68,11 +68,11 @@ class Settings(BaseSettings):
     ollama_embed_model: str = "nomic-embed-text:latest"
 
     # Auth - Tatlock integration
-    tatlock_api_url: str | None = "http://192.168.86.149:8000"
+    tatlock_api_url: str | None = "http://tatlock:8000"
     internal_api_key: str | None = None
 
     # Web search - SearXNG (use SEARXNG_URL env var to override)
-    searxng_url: str = "http://192.168.86.149:8087"
+    searxng_url: str = "http://searxng:8080"
     searxng_timeout: int = 10
 
     # Tool execution