feat(backend): add standalone data plane

Replace the Supabase application data plane with the Node/PostgreSQL API, migrate mobile, admin, web, and MCP callers, add controlled cutover tooling, and define hardened Dokploy infrastructure.

e2e/README.md

@@ -1,9 +1,13 @@
 # System E2E
 
 Tests assume `scripts/dev-local.sh up` is already running. Execute with
-`npm run verify:e2e`; the wrapper supplies local-only Supabase credentials and
-refuses remote hosts. Playwright retains traces, screenshots, and videos on
-failure under ignored output directories.
+`npm run verify:e2e`; application data must use the loopback standalone API and
+PostgreSQL. Playwright retains traces, screenshots, and videos on failure under
+ignored output directories.
 
 Native flows live under `maestro/` and run with `npm run test:mobile:e2e` after an
-iOS or Android build is installed.
+iOS or Android build is installed. `login-screen-smoke.yaml` is credential-free.
+`login-smoke.yaml` requires `E2E_EMAIL` and `E2E_PASSWORD` for a disposable,
+onboarding-complete user in the designated hosted non-production Supabase Auth
+project, with a matching standalone database profile. Never use production Auth,
+a subscriber account, or a service-role key for local/E2E acceptance.

e2e/maestro/login-screen-smoke.yaml

@@ -0,0 +1,19 @@
+appId: com.sauci.app
+name: Standalone-backend build reaches the Auth login screen
+---
+- launchApp:
+    clearState: true
+- waitForAnimationToEnd
+- tapOn:
+    point: "50%,25%"
+- tapOn:
+    text: "Continue"
+    optional: true
+- tapOn:
+    point: "94%,44%"
+- extendedWaitUntil:
+    visible: "Explore intimacy together"
+    timeout: 30000
+- assertVisible: "Sauci"
+- assertVisible: "Password"
+- takeScreenshot: "evidence/self-hosted-backend/ios-auth-login-current"

e2e/maestro/login-smoke.yaml

@@ -1,14 +1,43 @@
 appId: com.sauci.app
-name: Local fixture login reaches authenticated app
+name: Hosted Auth fixture reaches the standalone API-backed app
 ---
 - launchApp:
     clearState: true
+- waitForAnimationToEnd
+- tapOn:
+    point: "50%,25%"
+- tapOn:
+    text: "Continue"
+    optional: true
+- tapOn:
+    point: "94%,44%"
+- extendedWaitUntil:
+    visible: "Explore intimacy together"
+    timeout: 30000
 - tapOn: "Password"
 - tapOn: "Enter your email"
-- inputText: "e2e.alex@example.test"
+- eraseText
+- inputText: "${E2E_EMAIL}"
 - tapOn: "Enter your password"
-- inputText: "Sauci-e2e-only-2026!"
+- eraseText
+- setClipboard: "${E2E_PASSWORD}"
+- pasteText
+- tapOn: "Sauci"
+- scrollUntilVisible:
+    element:
+      text: "Sign In"
+    direction: DOWN
 - tapOn: "Sign In"
 - extendedWaitUntil:
     notVisible: "Sign In"
     timeout: 15000
+- tapOn:
+    text: "Not Now"
+    optional: true
+- extendedWaitUntil:
+    visible: "Discover"
+    timeout: 15000
+- assertVisible: "Adventure & Travel"
+- assertVisible: "Quality Time"
+- assertNotVisible: "No packs available"
+- takeScreenshot: "evidence/self-hosted-backend/ios-authenticated-api-current"