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>

.pre-commit-config.yaml

@@ -9,7 +9,7 @@ repos:
     hooks:
       - id: validate-architecture
         name: Validate Architecture Patterns
-        entry: python scripts/validate_architecture.py
+        entry: python scripts/validate/validate_architecture.py
         language: python
         pass_filenames: false
         always_run: true