feat: Script Generator Phase 1+2 — backend, engine, API, frontend, template editor, parameter detector

Complete Script Generator feature including:

Backend:
- ScriptCategory, ScriptTemplate, ScriptGeneration models
- ScriptTemplateEngine with substitution, filters, sanitization
- CRUD + share API endpoints with permission checks
- Integration tests for permissions and sharing
- Migration 057 with AD User Management seed templates

Frontend — Script Library:
- Browse templates with category tabs and search
- Configure pane with parameter form and script generation
- Script preview with live substitution and copy/download
- scriptGeneratorStore Zustand store

Frontend — Template Editor:
- Full CRUD form with metadata, script body (Monaco Editor), parameters
- ParameterSchemaBuilder with visual builder + JSON toggle
- ScriptManagePage with routing and nav link

Frontend — Parameter Detector:
- Client-side PowerShell parameter detection engine
- Detects script-level param() blocks and variable assignments
- Type inference from PS type annotations and value patterns
- ParameterDetectorStepper one-by-one review UI with accept/skip

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/router.py

@@ -16,6 +16,7 @@ from app.api.endpoints import tree_transfer
 from app.api.endpoints import ai_suggestions
 from app.api.endpoints import kb_accelerator
 from app.api.endpoints import beta_signup
+from app.api.endpoints import scripts
 
 api_router = APIRouter()
 
@@ -56,3 +57,4 @@ api_router.include_router(tree_transfer.router)
 api_router.include_router(ai_suggestions.router)
 api_router.include_router(kb_accelerator.router)
 api_router.include_router(beta_signup.router)
+api_router.include_router(scripts.router)