Add self-hosted auth, admin API, and owner web dashboard

- Replace Clerk with self-hosted JWT auth (register/login/verify, bcrypt
  passwords, Gmail OTP with console fallback)
- Add lib/db.ts pg pool + transaction helpers; seed script migrates legacy
  Clerk-era schema (drop clerk_id, enforce UUID ids and unique email)
- Add owner-gated admin API: stats, users, drivers CRUD, rides
- Add dashboard/ Vite React owner dashboard (login, overview, users,
  fleet, rides) with dev-server proxy to avoid Expo CORS middleware
- Add scripts/set-owner.mjs for role management

app/(root)/role.tsx

@@ -1,17 +1,17 @@
-import { useUser } from "@clerk/clerk-expo";
 import { router } from "expo-router";
 import { useState } from "react";
 import { Alert, Text, TouchableOpacity, View } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
 
 import { fetchAPI } from "@/lib/fetch";
+import { useSession } from "@/lib/session";
 
 const RoleSelection = () => {
-  const { user } = useUser();
+  const { setUserRole } = useSession();
   const [saving, setSaving] = useState(false);
 
   const chooseRole = async (role: "rider" | "driver") => {
-    if (!user?.id || saving) return;
+    if (saving) return;
 
     setSaving(true);
 
@@ -19,11 +19,13 @@ const RoleSelection = () => {
       const { error } = await fetchAPI("/(api)/user", {
         method: "PATCH",
         headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ clerkId: user.id, role }),
+        body: JSON.stringify({ role }),
       });
 
       if (error) throw new Error(error);
 
+      setUserRole(role);
+
       router.replace(
         role === "driver" ? "/(root)/driver-home" : "/(root)/(tabs)/home",
       );