feat: Filter out test-examples configs from API

Exclude configs in official/test-examples/ directory from API responses.

The test-examples directory contains 13 demo/test configs that are useful
for developers but should not appear in the production config gallery:
- ansible_unified.json
- django_unified.json
- example_pdf.json
- fastapi_unified.json
- fastapi_unified_test.json
- godot_github.json
- godot_unified.json
- httpx_comprehensive.json
- python-tutorial-test.json
- react_github.json
- react_unified.json
- template-example.json
- vue_unified.json

Changes:
- Added check in config_analyzer.py to skip files in test-examples/
- Production API will now return only 14 official configs
- Test configs remain in repo for developer reference

Result: Clean config gallery with only production-ready configs

Testing:
$ python3 -c "from config_analyzer import ConfigAnalyzer; from pathlib import Path; print(len(ConfigAnalyzer(Path('configs_repo/official')).analyze_all_configs()))"
14 # ✅ Previously 27 (included test-examples)

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

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

api/config_analyzer.py

@@ -78,6 +78,10 @@ class ConfigAnalyzer:
 
         # Find all JSON files recursively in configs directory and subdirectories
         for config_file in sorted(self.config_dir.rglob("*.json")):
+            # Skip test/example configs in test-examples directory
+            if "test-examples" in config_file.parts:
+                continue
+
             try:
                 metadata = self.analyze_config(config_file)
                 if metadata:  # Skip invalid configs