feat: add verification method, categories, and dedup UI to control library

- Migration 047: verification_method + category columns, 17 category lookup table
- Backend: new filters, GET /categories, GET /controls/{id}/similar (embedding-based)
- Frontend: filter dropdowns, badges, dedup UI in ControlDetail with merge workflow
- ControlForm: verification method + category selects
- Provenance: verification methods, categories, master library strategy sections
- Fix UUID cast syntax in generator routes (::uuid -> CAST)

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

backend-compliance/compliance/services/control_generator.py

@@ -725,7 +725,7 @@ Gib JSON zurück mit diesen Feldern:
                         controls_duplicates_found = :duplicates,
                         errors = :errors,
                         completed_at = NOW()
-                    WHERE id = :job_id::uuid
+                    WHERE id = CAST(:job_id AS uuid)
                 """),
                 {
                     "job_id": job_id,
@@ -832,7 +832,7 @@ Gib JSON zurück mit diesen Feldern:
                     ) VALUES (
                         :hash, :collection, :regulation_code,
                         :doc_version, :license, :rule,
-                        :path, :control_ids, :job_id::uuid
+                        :path, :control_ids, CAST(:job_id AS uuid)
                     )
                     ON CONFLICT (chunk_hash, collection, document_version) DO NOTHING
                 """),