Add Archer Template Library for risk acceptance form reuse

Adds a template management system to the Ivanti Queue's Archer Risk
Acceptance workflow. Templates store static form content (Environment
Overview, Segmentation, Mitigating Controls, etc.) organized by
Vendor > Platform > Model hierarchy.

Features:
- Full CRUD API at /api/archer-templates with search, filter, clone,
  and hierarchy navigation endpoints
- Template Manager page (nav: Template Mgr) with grouped list view,
  create/edit/clone/delete modals, role-based access
- TemplateSelector component integrated into Ivanti Todo Queue for
  Archer workflow items with per-section copy-to-clipboard buttons
  and Copy All functionality
- Database migration with case-insensitive uniqueness enforcement
- Audit logging for all template mutations

New files:
- backend/migrations/add_archer_templates_table.js
- backend/routes/archerTemplates.js
- frontend/src/components/pages/ArcherTemplatePage.js
- frontend/src/components/TemplateSelector.js
- frontend/src/components/TemplateFormModal.js
- frontend/src/components/DeleteConfirmModal.js

backend/migrations/add_archer_templates_table.js

@@ -0,0 +1,60 @@
+// Migration: Add archer_templates table for the Archer Template Library feature
+const pool = require('../db');
+
+async function run() {
+    console.log('Starting archer_templates table migration...');
+    try {
+        await pool.query(`
+            CREATE TABLE IF NOT EXISTS archer_templates (
+                id SERIAL PRIMARY KEY,
+                vendor VARCHAR(100) NOT NULL,
+                platform VARCHAR(100) NOT NULL,
+                model VARCHAR(100) NOT NULL,
+                environment_overview TEXT NOT NULL DEFAULT '',
+                segmentation TEXT NOT NULL DEFAULT '',
+                mitigating_controls TEXT NOT NULL DEFAULT '',
+                additional_info TEXT NOT NULL DEFAULT '',
+                charter_network_banner TEXT NOT NULL DEFAULT '',
+                data_classification TEXT NOT NULL DEFAULT '',
+                charter_network TEXT NOT NULL DEFAULT '',
+                additional_access_list TEXT NOT NULL DEFAULT '',
+                created_by INTEGER REFERENCES users(id) ON DELETE SET NULL,
+                created_at TIMESTAMPTZ DEFAULT NOW(),
+                updated_at TIMESTAMPTZ DEFAULT NOW()
+            )
+        `);
+        console.log('✓ archer_templates table created (or already exists)');
+
+        // Case-insensitive uniqueness on trimmed vendor/platform/model
+        await pool.query(`
+            CREATE UNIQUE INDEX IF NOT EXISTS idx_archer_templates_unique_combo
+            ON archer_templates (LOWER(TRIM(vendor)), LOWER(TRIM(platform)), LOWER(TRIM(model)))
+        `);
+        console.log('✓ idx_archer_templates_unique_combo index created (or already exists)');
+
+        // Indexes for list query performance
+        await pool.query(`
+            CREATE INDEX IF NOT EXISTS idx_archer_templates_vendor
+            ON archer_templates(vendor)
+        `);
+        console.log('✓ idx_archer_templates_vendor index created (or already exists)');
+
+        await pool.query(`
+            CREATE INDEX IF NOT EXISTS idx_archer_templates_platform
+            ON archer_templates(platform)
+        `);
+        console.log('✓ idx_archer_templates_platform index created (or already exists)');
+
+        console.log('Migration complete.');
+    } catch (err) {
+        console.error('Migration failed:', err.message);
+        throw err;
+    }
+}
+
+module.exports = { run };
+
+// Self-execute when run directly
+if (require.main === module) {
+    run().then(() => process.exit(0)).catch(() => process.exit(1));
+}