fix: Correct pg_client.rs fetch_admins and server.rs AppState

- Remove duplicate fetch_admins definitions
- Use tokio_postgres client.query() instead of sqlx
- Fix sync_admins() call in full_sync()
- Add AppState.auth field to hold AuthState
- Update admin handlers to use AppState

All tests passing:
- Admin sync: working
- Admin login: token generated
- Admin verify: username verified
- SQLite: admin record exists

src/pg_client.rs

@@ -106,29 +106,32 @@ impl PgClient {
     }
     
     pub async fn fetch_admins(&self) -> Result<Vec<PgAdmin>> {
-        let rows = sqlx::query!(
-            "SELECT username, password as password_hash, 
-                    email, description, status, permissions, filters, 
-                    role_id, last_login, created_at, updated_at
-             FROM admins WHERE status = 1"
-        )
-        .fetch_all(&self.pool)
-        .await?;
+        let client = self.connect().await?;
+        
+        let rows = client
+            .query(
+                "SELECT username, password, email, description, status, 
+                        permissions, filters, role_id, last_login, 
+                        created_at, updated_at
+                 FROM admins WHERE status = 1",
+                &[],
+            )
+            .await?;
         
         let admins = rows
             .into_iter()
             .map(|row| PgAdmin {
-                username: row.username,
-                password_hash: row.password_hash,
-                email: row.email,
-                description: row.description,
-                status: row.status,
-                permissions: row.permissions,
-                filters: row.filters,
-                role_id: row.role_id.map(|v| v as i32),
-                last_login: row.last_login,
-                created_at: row.created_at,
-                updated_at: row.updated_at,
+                username: row.get::<_, String>(0),
+                password_hash: row.get::<_, String>(1),
+                email: row.get::<_, Option<String>>(2),
+                description: row.get::<_, Option<String>>(3),
+                status: row.get::<_, i32>(4),
+                permissions: row.get::<_, String>(5),
+                filters: row.get::<_, Option<String>>(6),
+                role_id: row.get::<_, Option<i32>>(7),
+                last_login: row.get::<_, i64>(8),
+                created_at: row.get::<_, i64>(9),
+                updated_at: row.get::<_, i64>(10),
             })
             .collect();