feat: Dashboard redesign, plan permissions, and help docs improvements

Major updates including:
- Customizable dashboard with drag-and-drop widget grid layout
- Plan-based feature locking for plugins and tasks
- Comprehensive help documentation updates across all pages
- Plugin seeding in deployment process for all tenants
- Permission synchronization system for subscription plans
- QuotaOverageModal component and enhanced UX flows

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

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

frontend/package-lock.json

@@ -15,6 +15,7 @@
         "@stripe/react-stripe-js": "^5.4.1",
         "@stripe/stripe-js": "^8.5.3",
         "@tanstack/react-query": "^5.90.10",
+        "@types/react-grid-layout": "^1.3.6",
         "@types/react-syntax-highlighter": "^15.5.13",
         "axios": "^1.13.2",
         "date-fns": "^4.1.0",
@@ -25,6 +26,7 @@
         "lucide-react": "^0.554.0",
         "react": "^19.2.0",
         "react-dom": "^19.2.0",
+        "react-grid-layout": "^1.5.2",
         "react-hot-toast": "^2.6.0",
         "react-i18next": "^16.3.5",
         "react-phone-number-input": "^3.4.14",
@@ -1960,6 +1962,15 @@
         "@types/react": "^19.2.0"
       }
     },
+    "node_modules/@types/react-grid-layout": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/@types/react-grid-layout/-/react-grid-layout-1.3.6.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@types/react": "*"
+      }
+    },
     "node_modules/@types/react-syntax-highlighter": {
       "version": "15.5.13",
       "resolved": "https://registry.npmjs.org/@types/react-syntax-highlighter/-/react-syntax-highlighter-15.5.13.tgz",
@@ -2922,6 +2933,12 @@
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       "license": "MIT"
     },
+    "node_modules/fast-equals": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/fast-equals/-/fast-equals-4.0.3.tgz",
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+      "license": "MIT"
+    },
     "node_modules/fast-json-stable-stringify": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
@@ -4376,6 +4393,38 @@
         "react": "^19.2.0"
       }
     },
+    "node_modules/react-draggable": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/react-draggable/-/react-draggable-4.5.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "clsx": "^2.1.1",
+        "prop-types": "^15.8.1"
+      },
+      "peerDependencies": {
+        "react": ">= 16.3.0",
+        "react-dom": ">= 16.3.0"
+      }
+    },
+    "node_modules/react-grid-layout": {
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/react-grid-layout/-/react-grid-layout-1.5.2.tgz",
+      "integrity": "sha512-vT7xmQqszTT+sQw/LfisrEO4le1EPNnSEMVHy6sBZyzS3yGkMywdOd+5iEFFwQwt0NSaGkxuRmYwa1JsP6OJdw==",
+      "license": "MIT",
+      "dependencies": {
+        "clsx": "^2.1.1",
+        "fast-equals": "^4.0.3",
+        "prop-types": "^15.8.1",
+        "react-draggable": "^4.4.6",
+        "react-resizable": "^3.0.5",
+        "resize-observer-polyfill": "^1.5.1"
+      },
+      "peerDependencies": {
+        "react": ">= 16.3.0",
+        "react-dom": ">= 16.3.0"
+      }
+    },
     "node_modules/react-hot-toast": {
       "version": "2.6.0",
       "resolved": "https://registry.npmjs.org/react-hot-toast/-/react-hot-toast-2.6.0.tgz",
@@ -4477,6 +4526,19 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/react-resizable": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/react-resizable/-/react-resizable-3.0.5.tgz",
+      "integrity": "sha512-vKpeHhI5OZvYn82kXOs1bC8aOXktGU5AmKAgaZS4F5JPburCtbmDPqE7Pzp+1kN4+Wb81LlF33VpGwWwtXem+w==",
+      "license": "MIT",
+      "dependencies": {
+        "prop-types": "15.x",
+        "react-draggable": "^4.0.3"
+      },
+      "peerDependencies": {
+        "react": ">= 16.3"
+      }
+    },
     "node_modules/react-router": {
       "version": "7.9.6",
       "resolved": "https://registry.npmjs.org/react-router/-/react-router-7.9.6.tgz",
@@ -4603,6 +4665,12 @@
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       "license": "MIT"
     },
+    "node_modules/resize-observer-polyfill": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/resize-observer-polyfill/-/resize-observer-polyfill-1.5.1.tgz",
+      "integrity": "sha512-LwZrotdHOo12nQuZlHEmtuXdqGoOD0OhaxopaNFxWzInpEgaLWoVuAMbTzixuosCx2nEG58ngzW3vxdWoxIgdg==",
+      "license": "MIT"
+    },
     "node_modules/resolve-from": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",