revert(api): drop the dedicated v2 file-folder routes

File folders already live in the shared folder table as resourceType 'file'
(#6045 cut them over, #6051 dropped workspace_file_folders), and the remaining
file-specific folder machinery is being folded into the generic folder engine.
Publishing /api/v2/files/folders/** would pin that transitional split into a
public contract we'd then have to keep or break.

Files stay folder-aware — folderId/folderPath on the projection, folderId on
upload, and the move route — because a folder id is a folder.id and survives
the unification untouched. Folder management belongs on /api/v2/folders once
that surface serves resourceType 'file'; until then there is no v2 way to
enumerate file folders, which is the deliberate gap.

The orchestration classification fixes stay: the internal routes and the
copilot file-folder tools still call those perform* functions.

Author: TheodoreSpeaks

apps/docs/content/docs/de/api-reference/meta.json

@@ -14,7 +14,6 @@
     "(generated)/audit-logs",
     "(generated)/tables",
     "(generated)/files",
-    "(generated)/file-folders",
     "(generated)/knowledge-bases",
     "(generated)/mcp-servers",
     "(generated)/skills",

apps/docs/content/docs/en/api-reference/meta.json

@@ -14,7 +14,6 @@
     "(generated)/audit-logs",
     "(generated)/tables",
     "(generated)/files",
-    "(generated)/file-folders",
     "(generated)/knowledge-bases",
     "(generated)/mcp-servers",
     "(generated)/skills",

apps/docs/content/docs/es/api-reference/meta.json

@@ -14,7 +14,6 @@
     "(generated)/audit-logs",
     "(generated)/tables",
     "(generated)/files",
-    "(generated)/file-folders",
     "(generated)/knowledge-bases",
     "(generated)/mcp-servers",
     "(generated)/skills",

apps/docs/content/docs/fr/api-reference/meta.json

@@ -14,7 +14,6 @@
     "(generated)/audit-logs",
     "(generated)/tables",
     "(generated)/files",
-    "(generated)/file-folders",
     "(generated)/knowledge-bases",
     "(generated)/mcp-servers",
     "(generated)/skills",

apps/docs/content/docs/ja/api-reference/meta.json

@@ -14,7 +14,6 @@
     "(generated)/audit-logs",
     "(generated)/tables",
     "(generated)/files",
-    "(generated)/file-folders",
     "(generated)/knowledge-bases",
     "(generated)/mcp-servers",
     "(generated)/skills",

apps/docs/content/docs/zh/api-reference/meta.json

@@ -14,7 +14,6 @@
     "(generated)/audit-logs",
     "(generated)/tables",
     "(generated)/files",
-    "(generated)/file-folders",
     "(generated)/knowledge-bases",
     "(generated)/mcp-servers",
     "(generated)/skills",