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>

frontend/src/pages/ScriptManagePage.tsx

@@ -0,0 +1,44 @@
+import { useState } from 'react'
+import { ScriptTemplateListView } from '@/components/script-editor/ScriptTemplateListView'
+import { ScriptTemplateEditor } from '@/components/script-editor/ScriptTemplateEditor'
+
+export default function ScriptManagePage() {
+  const [mode, setMode] = useState<'list' | 'edit'>('list')
+  const [editingId, setEditingId] = useState<string | null>(null)
+
+  const handleEdit = (id: string) => {
+    setEditingId(id)
+    setMode('edit')
+  }
+
+  const handleCreate = () => {
+    setEditingId(null)
+    setMode('edit')
+  }
+
+  const handleBack = () => {
+    setEditingId(null)
+    setMode('list')
+  }
+
+  const handleSaved = () => {
+    setEditingId(null)
+    setMode('list')
+  }
+
+  return (
+    <div className="h-full overflow-y-auto">
+      <div className="p-6 max-w-5xl mx-auto">
+        {mode === 'list' ? (
+          <ScriptTemplateListView onEdit={handleEdit} onCreate={handleCreate} />
+        ) : (
+          <ScriptTemplateEditor
+            templateId={editingId}
+            onBack={handleBack}
+            onSaved={handleSaved}
+          />
+        )}
+      </div>
+    </div>
+  )
+}