fix: create command now properly supports multi-source configs

Fixes 3 critical bugs to enable unified create command for all config types:

1. Fixed _route_config() passing unsupported args to unified_scraper
   - Only pass --dry-run (the only supported behavioral flag)
   - Removed --name, --output, etc. (read from config file)

2. Fixed "source" not recognized as positional argument
   - Added "source" to positional args list in main.py
   - Enables: skill-seekers create <source>

3. Fixed "config" incorrectly treated as positional
   - Removed from positional args list (it's a --config flag)
   - Fixes backward compatibility with unified command

Added: configs/godot_unified.json
   - Multi-source config example (docs + source code)
   - Demonstrates documentation + codebase analysis

Result:
✅ skill-seekers create configs/godot_unified.json (works!)
✅ skill-seekers unified --config configs/godot_unified.json (still works!)
✅ 118 passed, 0 failures
✅ True single entry point achieved

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

src/skill_seekers/cli/main.py

@@ -139,13 +139,13 @@ def _reconstruct_argv(command: str, args: argparse.Namespace) -> list[str]:
 
         # Handle positional arguments (no -- prefix)
         if key in [
+            "source",  # create command
             "url",
             "directory",
             "file",
             "job_id",
             "skill_directory",
             "zip_file",
-            "config",
             "input_file",
         ]:
             if value is not None and value != "":