docs: refresh stale docs to match current implementation

Documentation pass — reviewed codebase in full, identified stale references,
and aligned docs with actual code state.

Changes:
- CLAUDE.md, PRODUCTION_SETUP.md, LAUNCH_CHECKLIST.md, src/auth.config.ts:
  middleware path src/middleware.ts → src/proxy.ts (Next.js 16+ convention)
- CLAUDE.md, ENVIRONMENT.md, README.md:
  dev server port localhost:3000 → localhost:4000 (per package.json dev
  script 'next dev --webpack -H 0.0.0.0 -p 4000')
- PRODUCTION_DEPLOYMENT_CHECKLIST.md:
  rewrote migration list — actual db/migrations/ contains 10 files
  (0000–0091), not the Supabase-era 001–092 series. Updated platform
  version 1.6 → 2.0 and last-updated stamp.
- MEMORY.md:
  refreshed 'Last updated' to 2026-06-25 and added a current-state header
  flagging the 'Auth.js v5 wiring' section as historical (current auth
  is Neon Auth/Better Auth). Also flags the 'GitHub origin' notes as
  historical (only Gitea origin exists).
- LAUNCH_CHECKLIST.md:
  added 'Last updated: 2026-06-25' header and refresh note in footer.

Verification:
- npx tsc --noEmit: pre-existing Stripe API version + test mock errors
  only (verified by stashing changes and re-running — same error set).
- No new errors introduced.

CLAUDE.md

@@ -38,7 +38,7 @@ npx playwright test  # Run E2E tests (Playwright)
 
 **Historical migration work is documented in `MEMORY.md`** (Supabase login + link process, updates to `push-migrations.js` for the modern CLI, specific SQL patches made to 091/145/148/200/201 so they would apply cleanly, and which migrations were pushed). Cat `MEMORY.md` for details.
 
-E2E tests live in `tests/` and run via Playwright. Specs include `tests/smoke.spec.ts` and `tests/login/login-flow.spec.ts`. **Note: `playwright.config.ts` defaults `baseURL` to production** (`https://route-commerce-platform.vercel.app`); override with `PLAYWRIGHT_URL=http://localhost:3000` for local runs, or pass `--config` with a local config.
+E2E tests live in `tests/` and run via Playwright. Specs include `tests/smoke.spec.ts` and `tests/login/login-flow.spec.ts`. **Note: `playwright.config.ts` defaults `baseURL` to production** (`https://route-commerce-platform.vercel.app`); override with `PLAYWRIGHT_URL=http://localhost:4000` for local runs (the dev server binds to port `4000`), or pass `--config` with a local config.
 
 ---
 
@@ -51,12 +51,12 @@ E2E tests live in `tests/` and run via Playwright. Specs include `tests/smoke.sp
 **Auth flow:**
 1. User signs in via `/api/auth/sign-in` → Neon Auth validates credentials → session cookie set
 2. `getAdminUser()` in `src/lib/admin-permissions.ts` reads the Neon Auth session and looks up `admin_users` by email
-3. Middleware (`src/middleware.ts`) guards `/admin/*` routes at the edge level
+3. Middleware (`src/proxy.ts`) guards `/admin/*` routes at the edge level
 
 **Key files:**
 - `src/lib/auth.ts` — Neon Auth configuration (getSession, signIn, signOut, resetPassword, requestPasswordReset)
 - `src/auth.config.ts` — Edge-safe config (baseUrl, cookieSecret)
-- `src/middleware.ts` — Edge-level route protection
+- `src/proxy.ts` — Edge-level route protection
 - `src/app/api/auth/sign-in/route.ts` — Email/password sign-in API
 - `src/app/api/auth/forgot-password/route.ts` — Password reset request API
 - `src/app/api/auth/reset-password/route.ts` — Password reset confirmation API
@@ -300,7 +300,7 @@ Separate from orders/stops — tracks irrigation/water usage per brand. `src/act
 | Neon Auth configuration | `src/lib/auth.ts`, `src/auth.config.ts` |
 | Auth API routes | `src/app/api/auth/sign-in/route.ts`, `src/app/api/auth/forgot-password/route.ts`, `src/app/api/auth/reset-password/route.ts`, `src/app/api/auth/[...nextauth]/route.ts` |
 | Admin auth + permissions | `src/lib/admin-permissions.ts`, `src/lib/admin-permissions-types.ts` |
-| Middleware (route protection) | `src/middleware.ts` |
+| Middleware (route protection) | `src/proxy.ts` |
 | Server actions | `src/actions/*.ts` (one file per domain; also grouped into `src/actions/{admin,ai,billing,communications,harvest-reach,integrations,orders,products,settings,shipping,stops,water-log,platform,route-trace,time-tracking,email-automation}/`) |
 | Admin pages | `src/app/admin/[module]/page.tsx` |
 | Admin client components | `src/components/admin/*.tsx` |