fix: Load admin credentials from .env file

- Add dotenv dependency and load .env configuration in auth.ts
- Admin credentials now read from environment variables:
  - ADMIN_USERNAME (default: owner)
  - ADMIN_PASSWORD_HASH (default: admin123 hash)
  - ADMIN_EMAIL (default: owner@stargirlnails.de)
- Remove hardcoded admin credentials
- Add fallback values for backward compatibility
- Clear existing user storage to force recreation with new credentials

package.json

@@ -17,6 +17,7 @@
     "@orpc/tanstack-query": "^1.8.8",
     "@tailwindcss/vite": "^4.1.12",
     "@tanstack/react-query": "^5.85.5",
+    "dotenv": "^17.2.3",
     "hono": "^4.9.4",
     "jsonrepair": "^3.13.0",
     "openai": "^5.17.0",

pnpm-lock.yaml

@@ -23,6 +23,9 @@ importers:
       '@tanstack/react-query':
         specifier: ^5.85.5
         version: 5.85.5(react@19.1.1)
+      dotenv:
+        specifier: ^17.2.3
+        version: 17.2.3
       hono:
         specifier: ^4.9.4
         version: 4.9.4
@@ -942,6 +945,10 @@ packages:
     resolution: {integrity: sha512-3UDv+G9CsCKO1WKMGw9fwq/SWJYbI0c5Y7LU1AXYoDdbhE2AHQ6N6Nb34sG8Fj7T5APy8qXDCKuuIHd1BR0tVA==}
     engines: {node: '>=8'}
 
+  dotenv@17.2.3:
+    resolution: {integrity: sha512-JVUnt+DUIzu87TABbhPmNfVdBDt18BLOWjMUFJMSi/Qqg7NTYtabbvSNJGOJ7afbRuv9D/lngizHtP7QyLQ+9w==}
+    engines: {node: '>=12'}
+
   electron-to-chromium@1.5.171:
     resolution: {integrity: sha512-scWpzXEJEMrGJa4Y6m/tVotb0WuvNmasv3wWVzUAeCgKU0ToFOhUW6Z+xWnRQANMYGxN4ngJXIThgBJOqzVPCQ==}
 
@@ -2498,6 +2505,8 @@ snapshots:
 
   detect-libc@2.0.4: {}
 
+  dotenv@17.2.3: {}
+
   electron-to-chromium@1.5.171: {}
 
   enhanced-resolve@5.18.3:

src/server/rpc/auth.ts

@@ -2,6 +2,10 @@ import { call, os } from "@orpc/server";
 import { z } from "zod";
 import { randomUUID } from "crypto";
 import { createKV } from "@/server/lib/create-kv";
+import { config } from "dotenv";
+
+// Load environment variables from .env file
+config();
 
 const UserSchema = z.object({
   id: z.string(),