chore(studio): update self-hosted MCP server to 0.12.0 (#50007)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Dependency update.

## What is the current behavior?

`apps/studio` depends on `@supabase/mcp-server-supabase` `^0.11.0`,
which pulls in `@supabase/mcp-utils` `0.7.0` transitively.

## What is the new behavior?

- Bump `@supabase/mcp-server-supabase` to `^0.12.0`. The lockfile moves
it to `0.12.0` and its `@supabase/mcp-utils` dep to `0.8.0` (still
indirect). Nothing else in the lockfile changes.
- Peer deps are unchanged (`@modelcontextprotocol/server ^2.0.0`, `zod
^3.25.0 || ^4.0.0`).

No studio code change needed. 0.12.0 adds an optional `costConfirmation`
server option for `create_project` / `create_branch`; the self-hosted
route doesn't set it, and self-hosted never registers those tools in the
first place. The exported tool set is the same 33 schemas, so the
tool-name guard in `lib/ai/tools/mcp-tools.ts` still passes.
`get_advisors` now groups lints inside its result, which studio forwards
to the model without parsing. Release notes: [mcp-server-supabase
v0.12.0](https://github.com/supabase/mcp/releases/tag/mcp-server-supabase-v0.12.0)
and [mcp-utils
v0.8.0](https://github.com/supabase/mcp/releases/tag/mcp-utils-v0.8.0).

## Additional context


[AI-1178](https://linear.app/supabase/issue/AI-1178/2b-update-self-hosted-remote-mcp-server)

Testing:
- `pnpm install --frozen-lockfile` passes.
- Studio `pnpm typecheck` is clean.
- MCP-related vitest files: 13 files, 108 tests passed.
- In-memory smoke of `createSupabaseMcpServer` with the self-hosted
route's options reports `serverInfo.version` `0.12.0` and 11 tools.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
  * Updated the Supabase MCP integration dependency to version 0.12.0.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

apps/studio/package.json

@@ -71,7 +71,7 @@
     "@stripe/stripe-js": "9.1.0",
     "@stripe/sync-engine": "1.0.32",
     "@supabase/auth-js": "catalog:",
-    "@supabase/mcp-server-supabase": "^0.11.0",
+    "@supabase/mcp-server-supabase": "^0.12.0",
     "@supabase/pg-meta": "workspace:*",
     "@supabase/realtime-js": "catalog:",
     "@supabase/shared-types": "0.1.91",