feat: 龙虾记忆同步系统完整版本

功能特性:
- 文件树展示
- 差异对比
- 双向同步（本地 <-> 数据库）
- 版本历史追踪
- 统计信息展示

核心补丁:
1. 分块读取与流式传输（防止大文件内存飙升）
2. .lobsterignore 机制（排除临时文件）
3. 操作溯源（Audit Log，记录同步历史）

技术栈:
- 后端: Django + DRF + PostgreSQL
- 前端: React + Ant Design
- 部署: Docker + Docker Compose

项目已完整部署，可直接使用 docker-compose up -d 启动

backend/memory_app/models.py

@@ -0,0 +1,125 @@
+from django.db import models
+from django.core.validators import FileExtensionValidator
+import hashlib
+
+
+class LobsterMemory(models.Model):
+    """龙虾记忆文件模型"""
+
+    STATUS_CHOICES = [
+        ('consistent', '一致'),
+        ('local_newer', '本地更新'),
+        ('db_newer', '数据库更新'),
+        ('conflict', '冲突'),
+    ]
+
+    lobster_id = models.CharField(max_length=50, help_text='龙虾ID')
+
+    file_path = models.CharField(max_length=500, help_text='文件相对路径')
+
+    content = models.TextField(help_text='文件内容')
+
+    hash = models.CharField(max_length=64, help_text='SHA256哈希')
+
+    status = models.CharField(
+        max_length=20,
+        choices=STATUS_CHOICES,
+        default='consistent',
+        help_text='同步状态'
+    )
+
+    version = models.IntegerField(default=1, help_text='版本号')
+
+    size = models.IntegerField(default=0, help_text='文件大小（字节）')
+
+    created_at = models.DateTimeField(auto_now_add=True, help_text='创建时间')
+
+    updated_at = models.DateTimeField(auto_now=True, help_text='更新时间')
+
+    class Meta:
+        db_table = 'lobster_memory'
+        unique_together = ('lobster_id', 'file_path', 'version')
+        ordering = ['-updated_at']
+        indexes = [
+            models.Index(fields=['lobster_id', 'file_path']),
+            models.Index(fields=['status']),
+            models.Index(fields=['updated_at']),
+        ]
+
+    def __str__(self):
+        return f"{self.lobster_id}/{self.file_path} (v{self.version})"
+
+    def compute_hash(self, content):
+        """计算SHA256哈希"""
+        return hashlib.sha256(content.encode('utf-8')).hexdigest()
+
+    def save(self, *args, **kwargs):
+        """保存时自动计算哈希和大小"""
+        if self.content:
+            self.hash = self.compute_hash(self.content)
+            self.size = len(self.content.encode('utf-8'))
+        super().save(*args, **kwargs)
+
+
+class SyncHistory(models.Model):
+    """同步操作历史记录"""
+
+    ACTION_CHOICES = [
+        ('sync_to_db', '同步到数据库'),
+        ('sync_to_local', '同步到本地'),
+        ('auto_sync', '自动同步'),
+        ('manual_merge', '手动合并'),
+    ]
+
+    STATUS_CHOICES = [
+        ('success', '成功'),
+        ('failed', '失败'),
+        ('partial', '部分成功'),
+    ]
+
+    lobster_id = models.CharField(max_length=50, help_text='龙虾ID')
+
+    file_path = models.CharField(max_length=500, help_text='文件相对路径')
+
+    action = models.CharField(
+        max_length=20,
+        choices=ACTION_CHOICES,
+        help_text='操作类型'
+    )
+
+    status = models.CharField(
+        max_length=20,
+        choices=STATUS_CHOICES,
+        help_text='操作状态'
+    )
+
+    old_version = models.IntegerField(null=True, blank=True, help_text='操作前版本')
+
+    new_version = models.IntegerField(null=True, blank=True, help_text='操作后版本')
+
+    old_hash = models.CharField(max_length=64, null=True, blank=True, help_text='操作前哈希')
+
+    new_hash = models.CharField(max_length=64, null=True, blank=True, help_text='操作后哈希')
+
+    file_size = models.IntegerField(default=0, help_text='文件大小（字节）')
+
+    operator = models.CharField(max_length=50, default='system', help_text='操作者')
+
+    error_message = models.TextField(null=True, blank=True, help_text='错误信息')
+
+    execution_time = models.FloatField(default=0, help_text='执行时间（秒）')
+
+    created_at = models.DateTimeField(auto_now_add=True, help_text='操作时间')
+
+    class Meta:
+        db_table = 'sync_history'
+        ordering = ['-created_at']
+        indexes = [
+            models.Index(fields=['lobster_id', 'file_path']),
+            models.Index(fields=['action']),
+            models.Index(fields=['status']),
+            models.Index(fields=['created_at']),
+        ]
+
+    def __str__(self):
+        return f"{self.action} - {self.lobster_id}/{self.file_path} ({self.status})"