Add comprehensive API documentation for ThrillWiki integration and features

- Introduced Next.js integration guide for ThrillWiki API, detailing authentication, core domain APIs, data structures, and implementation patterns.
- Documented the migration to Rich Choice Objects, highlighting changes for frontend developers and enhanced metadata availability.
- Fixed the missing `get_by_slug` method in the Ride model, ensuring proper functionality of ride detail endpoints.
- Created a test script to verify manufacturer syncing with ride models, ensuring data integrity across related models.

backend/VERIFICATION_COMMANDS.md

@@ -0,0 +1,73 @@
+# Independent Verification Commands
+
+Run these commands yourself to verify ALL tuple fallbacks have been eliminated:
+
+## 1. Search for the most common tuple fallback patterns:
+
+```bash
+# Search for choices.get(value, fallback) patterns
+grep -r "choices\.get(" apps/ --include="*.py" | grep -v migration
+
+# Search for status_*.get(value, fallback) patterns  
+grep -r "status_.*\.get(" apps/ --include="*.py" | grep -v migration
+
+# Search for category_*.get(value, fallback) patterns
+grep -r "category_.*\.get(" apps/ --include="*.py" | grep -v migration
+
+# Search for sla_hours.get(value, fallback) patterns
+grep -r "sla_hours\.get(" apps/ --include="*.py"
+
+# Search for the removed functions
+grep -r "get_tuple_choices\|from_tuple\|convert_tuple_choices" apps/ --include="*.py" | grep -v migration
+```
+
+**Expected result: ALL commands should return NOTHING (empty results)**
+
+## 2. Verify the removed function is actually gone:
+
+```bash
+# This should fail with ImportError
+python -c "from apps.core.choices.registry import get_tuple_choices; print('ERROR: Function still exists!')"
+
+# This should work
+python -c "from apps.core.choices.registry import get_choices; print('SUCCESS: Rich Choice objects work')"
+```
+
+## 3. Verify Django system integrity:
+
+```bash
+python manage.py check
+```
+
+**Expected result: Should pass with no errors**
+
+## 4. Manual spot check of previously problematic files:
+
+```bash
+# Check rides events (previously had 3 fallbacks)
+grep -n "\.get(" apps/rides/events.py | grep -E "(choice|status|category)"
+
+# Check template tags (previously had 2 fallbacks)  
+grep -n "\.get(" apps/rides/templatetags/ride_tags.py | grep -E "(choice|category|image)"
+
+# Check admin (previously had 2 fallbacks)
+grep -n "\.get(" apps/rides/admin.py | grep -E "(choice|category)"
+
+# Check moderation (previously had 3 SLA fallbacks)
+grep -n "sla_hours\.get(" apps/moderation/
+```
+
+**Expected result: ALL should return NOTHING**
+
+## 5. Run the verification script:
+
+```bash
+python verify_no_tuple_fallbacks.py
+```
+
+**Expected result: Should print "SUCCESS: ALL TUPLE FALLBACKS HAVE BEEN ELIMINATED!"**
+
+---
+
+If ANY of these commands find tuple fallbacks, then I was wrong. 
+If ALL commands return empty/success, then ALL tuple fallbacks have been eliminated.