**Stack 4/6** of the TanStack Start migration (#46424). Stacked on
**#47112** (S3).
> [!NOTE]
> Mechanical and homogeneous — every file is the same shape: a
`createFileRoute(...)` whose `server.handlers` delegate to the existing
`pages/api` handler via `toWebHandler` (the compat shim from S2). The
pages-router handlers are unchanged; Next still serves them directly and
ignores `routes/`.
## What's in this PR
- `routes/api/**` (~104 files): platform (`pg-meta`, auth, storage,
integrations, profile, telemetry, organizations, projects…), `ai/*`,
`v1/*`, `connect`, `content`/`mcp`, and standalone endpoints
(`deployment-mode`, `get-ip-address`, etc.).
- `routeTree.gen.ts` — **regenerated** for the routes present so far
(root + auth/app + api).
## Review tip
The route files are near-identical wrappers, so this is fast to skim.
The generated `routeTree.gen.ts` isn't meaningful review surface.
## Verification
On top of S1–S3: `studio` typecheck ✓, lint (0 errors) ✓.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added Model Context Protocol (MCP) API endpoint with configurable
feature support and read-only mode
* Added function artifact streaming capability for self-hosted functions
* **Chores**
* Migrated API route infrastructure for improved system architecture
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Alaister Young <10985857+alaister@users.noreply.github.com>
Co-authored-by: Ivan Vasilov <vasilov.ivan@gmail.com>
