Initialize Fonrey Django multi-tenant project skeleton

Set up the required directory layout, app scaffolding, core settings, templates, static assets, and Docker/Tailwind tooling to establish a standardized development baseline.

core/encryption.py

@@ -0,0 +1,35 @@
+import base64
+import hashlib
+
+from cryptography.fernet import Fernet
+from django.conf import settings
+
+
+class PhoneEncryption:
+    """
+    手机号 AES-256-GCM 加密存储 + SHA-256 哈希索引
+    存储字段：phone_encrypted（加密密文）+ phone_hash（哈希，用于精确查询）
+    显示：脱敏格式 138****1234
+    """
+
+    @staticmethod
+    def encrypt(phone: str) -> str:
+        """加密手机号，返回 base64 密文"""
+        ...
+
+    @staticmethod
+    def decrypt(ciphertext: str) -> str:
+        """解密返回明文"""
+        ...
+
+    @staticmethod
+    def hash(phone: str) -> str:
+        """返回 SHA-256 哈希（用于 DB 索引查询）"""
+        ...
+
+    @staticmethod
+    def mask(phone: str) -> str:
+        """返回脱敏格式：138****1234"""
+        if not phone or len(phone) < 7:
+            return "***"
+        return phone[:3] + "****" + phone[-4:]