feat: Enhance ticketing system with categories, templates, SLA tracking, and fix frontend integration

- Add ticket categories (billing, technical, feature_request, etc.) with type-specific options
- Add TicketTemplate and CannedResponse models for quick ticket creation
- Implement SLA tracking with due_at and first_response_at fields
- Add is_platform_admin and is_customer helper functions to fix permission checks
- Register models in Django admin with filters and fieldsets
- Enhance signals with error handling for WebSocket notifications
- Fix frontend API URLs for templates and canned responses
- Update PlatformSupport page to use real ticketing API
- Add comprehensive i18n translations for all ticket fields

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/package-lock.json

@@ -8,6 +8,8 @@
       "name": "frontend",
       "version": "0.0.0",
       "dependencies": {
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+        "@dnd-kit/utilities": "^3.2.2",
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@@ -19,6 +21,7 @@
         "lucide-react": "^0.554.0",
         "react": "^19.2.0",
         "react-dom": "^19.2.0",
+        "react-hot-toast": "^2.6.0",
         "react-i18next": "^16.3.5",
         "react-phone-number-input": "^3.4.14",
         "react-router-dom": "^7.9.6",
@@ -347,6 +350,45 @@
         "node": ">=6.9.0"
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+    "node_modules/@dnd-kit/accessibility": {
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+      "resolved": "https://registry.npmjs.org/@dnd-kit/accessibility/-/accessibility-3.1.1.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      "peerDependencies": {
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+        "@dnd-kit/utilities": "^3.2.2",
+        "tslib": "^2.0.0"
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+      "peerDependencies": {
+        "react": ">=16.8.0",
+        "react-dom": ">=16.8.0"
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+    },
+    "node_modules/@dnd-kit/utilities": {
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+      "resolved": "https://registry.npmjs.org/@dnd-kit/utilities/-/utilities-3.2.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      "peerDependencies": {
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-      "devOptional": true,
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     "node_modules/d3-array": {
@@ -2994,6 +3035,15 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/goober": {
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+      "resolved": "https://registry.npmjs.org/goober/-/goober-2.1.18.tgz",
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+      "license": "MIT",
+      "peerDependencies": {
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+    },
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       "version": "1.2.0",
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@@ -4006,6 +4056,23 @@
         "react": "^19.2.0"
       }
     },
+    "node_modules/react-hot-toast": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/react-hot-toast/-/react-hot-toast-2.6.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "csstype": "^3.1.3",
+        "goober": "^2.1.16"
+      },
+      "engines": {
+        "node": ">=10"
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+      "peerDependencies": {
+        "react": ">=16",
+        "react-dom": ">=16"
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     "node_modules/react-i18next": {
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       "license": "MIT"
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     "node_modules/type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",