refactor(scripts): reorganize scripts/ into seed/ and validate/ subfolders

Move 9 init/seed scripts into scripts/seed/ and 7 validation scripts
(+ validators/ subfolder) into scripts/validate/ to reduce clutter in
the root scripts/ directory. Update all references across Makefile,
CI/CD configs, pre-commit hooks, docs (~40 files), and Python imports.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/development/database-seeder/database-init-guide.md

@@ -368,7 +368,7 @@ make help-db
 
 ### Adding New Admin Settings
 
-Edit `scripts/init_production.py` to add new platform settings:
+Edit `scripts/seed/init_production.py` to add new platform settings:
 
 ```python
 def create_admin_settings(db: Session) -> int:
@@ -391,7 +391,7 @@ def create_admin_settings(db: Session) -> int:
 
 ### Adding New Demo Data
 
-Edit `scripts/seed_demo.py` to extend demo data creation:
+Edit `scripts/seed/seed_demo.py` to extend demo data creation:
 
 ```python
 def seed_demo_data(db: Session, auth_manager: AuthManager):
@@ -468,7 +468,7 @@ if settings.your_boolean_setting:
 
 ### Adding New Demo Store Configurations
 
-Edit the `DEMO_STORES` list in `scripts/seed_demo.py`:
+Edit the `DEMO_STORES` list in `scripts/seed/seed_demo.py`:
 
 ```python
 DEMO_STORES = [
@@ -507,7 +507,7 @@ Add corresponding Makefile command:
 ```makefile
 seed-demo-custom:
 	@echo 🎪 Seeding custom demo data...
-	@set SEED_MODE=custom&& $(PYTHON) scripts/seed_demo.py
+	@set SEED_MODE=custom&& $(PYTHON) scripts/seed/seed_demo.py
 	@echo ✅ Custom demo seeding completed
 ```
 

docs/development/database-seeder/database-seeder-documentation.md

@@ -364,7 +364,7 @@ To create platform-level default content pages (About, Contact, FAQ, Shipping, R
 ```bash
 make create-cms-defaults
 # or
-python scripts/create_default_content_pages.py
+python scripts/seed/create_default_content_pages.py
 ```
 
 This creates 7 platform default pages that all stores inherit:

docs/development/database-seeder/makefile-database-seeder.md

@@ -171,7 +171,7 @@ migrate-status:
 
 backup-db:
 	@echo Creating database backup...
-	@$(PYTHON) scripts/backup_database.py
+	@$(PYTHON) scripts/seed/backup_database.py
 
 seed:
 	@echo Seeding database with comprehensive test data...