docs: update CLAUDE.md for pnpm and corrected route paths

CLAUDE.md

@@ -8,10 +8,10 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 # Development
 make dev              # start backend + frontend in parallel
 make dev-backend      # cargo run (port 3000)
-make dev-frontend     # npm run dev (port 5173, /api proxied to :3000)
+make dev-frontend     # pnpm dev (port 5173, /api proxied to :3000)
 
 # Build
-make build            # npm run build, then cargo build --release
+make build            # pnpm build, then cargo build --release
 make compose-up       # docker compose build + start
 
 # Backend
@@ -19,9 +19,9 @@ cargo test            # run all tests (uses sqlx::test macro — no DB setup nee
 cargo check           # fast type check without linking
 
 # Frontend
-npm run check         # TypeScript + Svelte type check
-npm run check:watch   # watch mode
-npm run build         # Vite build to dist/
+pnpm check            # TypeScript + Svelte type check
+pnpm check:watch      # watch mode
+pnpm build            # Vite build to dist/
 ```
 
 ## Architecture
@@ -47,7 +47,7 @@ Route handlers live in `backend/src/routes/` and are merged into the main router
 - **Types**: `src/lib/types.ts` mirrors the Rust models exactly — keep them in sync when changing the API
 
 Routes:
-- `routes/login/` — public login
+- `routes/admin/login/` — public login
 - `routes/admin/` — all tutor-facing pages (guarded by `+layout.svelte` auth check)
 - `routes/s/[code]/` — public student check-in page