Introduce standalone page (#19675)

Add support for standalone pages: a new `PageLayout` type
(`STANDALONE_PAGE`) that can be rendered independently at
`/page/:pageLayoutId`, not tied to any record or object context.

- New `STANDALONE_PAGE` page layout type
- New `PAGE_LAYOUT` navigation menu item type: adds a `pageLayoutId`
foreign key to `NavigationMenuItemEntity`, allowing sidebar items to
link directly to standalone pages
- New `GLOBAL_OBJECT_CONTEXT` command menu availability type: separates
object-context-dependent commands (Create Record, Import, Export, See
Deleted, Create View, Hide Deleted) from truly global ones, so
standalone pages only show relevant commands
- Frontend routing & rendering: adds a `/page/:pageLayoutId` route with
its own page component, header, and command menu
- Widget rendering refactor
- Instance commands: two fast 1.22 migrations: `pageLayoutId` column +
`STANDALONE_PAGE` enum, and `GLOBAL_OBJECT_CONTEXT` availability type
enum
- Workspace command: backfills existing command menu items from `GLOBAL`
to `GLOBAL_OBJECT_CONTEXT` where appropriate
- Dev seeds: adds a sample "Star History" standalone page with an iframe
widget for local development

packages/twenty-server/src/engine/core-modules/open-api/utils/components.utils.ts

@@ -1100,7 +1100,12 @@ export const computeMetadataSchemaComponents = (
               name: { type: 'string' },
               type: {
                 type: 'string',
-                enum: ['RECORD_INDEX', 'RECORD_PAGE', 'DASHBOARD'],
+                enum: [
+                  'RECORD_INDEX',
+                  'RECORD_PAGE',
+                  'DASHBOARD',
+                  'STANDALONE_PAGE',
+                ],
                 default: 'RECORD_PAGE',
               },
               objectMetadataId: { type: 'string', format: 'uuid' },
@@ -1121,7 +1126,12 @@ export const computeMetadataSchemaComponents = (
               name: { type: 'string' },
               type: {
                 type: 'string',
-                enum: ['RECORD_INDEX', 'RECORD_PAGE', 'DASHBOARD'],
+                enum: [
+                  'RECORD_INDEX',
+                  'RECORD_PAGE',
+                  'DASHBOARD',
+                  'STANDALONE_PAGE',
+                ],
               },
               objectMetadataId: { type: 'string', format: 'uuid' },
             },
@@ -1134,7 +1144,12 @@ export const computeMetadataSchemaComponents = (
               name: { type: 'string' },
               type: {
                 type: 'string',
-                enum: ['RECORD_INDEX', 'RECORD_PAGE', 'DASHBOARD'],
+                enum: [
+                  'RECORD_INDEX',
+                  'RECORD_PAGE',
+                  'DASHBOARD',
+                  'STANDALONE_PAGE',
+                ],
               },
               objectMetadataId: { type: 'string', format: 'uuid' },
               tabs: {