Fix resource files not being installed with pip/uv

## Problem
When installing via `pip install` or `uv add`, the resources folder was not
being installed to site-packages. The YAML files were only included in the
source tarball but not in the wheel distribution.

## Solution
- Moved resources/ into lightspeed_stack_providers/ package
- Added __init__.py files to make resources a proper Python package
- Updated package-data configuration with explicit file listing (no wildcards)
- Updated MANIFEST.in to reflect new location
- Updated run.yaml and docker-compose.yml paths

## Security
This approach is defensive:
- Explicitly lists only the 6 required YAML files
- No wildcards that could accidentally include sensitive files
- Standard Python package structure using importlib.resources

## Testing
Verified that:
- All 6 YAML files are in the wheel
- Files install correctly to site-packages
- No unintended files (run.yaml, .env, etc.) are included

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: are-ces

MANIFEST.in

@@ -1,2 +1,2 @@
-recursive-include resources *.yaml
+recursive-include lightspeed_stack_providers/resources *.yaml
 include README.md

docker-compose.yml

@@ -8,7 +8,7 @@ services:
       - "8321:8321"
     volumes:
       - ./run.yaml:/app/run.yaml
-      - ./resources/external_providers:/app/providers.d
+      - ./lightspeed_stack_providers/resources/external_providers:/app/providers.d
     environment:
       - OPENAI_API_KEY=${OPENAI_API_KEY}
       - EXTERNAL_PROVIDERS_DIR=/app/providers.d