fix: 统一路径分隔符为正斜杠，修复 macOS/Linux 兼容性

all_keys.json 中的 key 统一使用 `/` 作为路径分隔符，
消除 Windows 反斜杠硬编码，确保跨平台兼容。

涉及文件: find_all_keys.py, decrypt_db.py, monitor.py,
monitor_web.py, mcp_server.py, decode_image.py, latency_test.py

Fixes #17

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

monitor_web.py

@@ -62,7 +62,7 @@ def _build_emoji_lookup(keys_dict):
     """从 emoticon.db 构建 emoji md5 → URL 映射（直接解密，不走 cache）"""
     global _emoji_lookup, _emoji_keys_dict, _emoji_last_refresh
     _emoji_keys_dict = keys_dict
-    key_info = keys_dict.get("emoticon\\emoticon.db")
+    key_info = keys_dict.get("emoticon/emoticon.db")
     if not key_info:
         print("[emoji] 无 emoticon.db key，跳过", flush=True)
         return
@@ -260,7 +260,7 @@ class MonitorDBCache:
         lock = self._get_lock(rel_key)
         with lock:
             enc_key = bytes.fromhex(self.keys[rel_key]["enc_key"])
-            rel_path = rel_key.replace('\\', os.sep)
+            rel_path = rel_key.replace('/', os.sep)
             db_path = os.path.join(DB_DIR, rel_path)
             wal_path = db_path + "-wal"
 
@@ -273,7 +273,7 @@ class MonitorDBCache:
             except OSError:
                 return None
 
-            out_name = rel_key.replace('\\', '_')
+            out_name = rel_key.replace('/', '_')
             out_path = os.path.join(self.tmp_dir, out_name)
 
             prev = self._state.get(rel_key)
@@ -313,7 +313,7 @@ def build_username_db_map():
     # 先获取每个 DB 的 mtime 用于排序
     db_mtimes = {}
     for i in range(5):
-        rel_key = f"message\\message_{i}.db"
+        rel_key = f"message/message_{i}.db"
         db_path = os.path.join(DB_DIR, "message", f"message_{i}.db")
         try:
             db_mtimes[rel_key] = os.path.getmtime(db_path)
@@ -326,7 +326,7 @@ def build_username_db_map():
         db_path = os.path.join(decrypted_msg_dir, f"message_{i}.db")
         if not os.path.exists(db_path):
             continue
-        rel_key = f"message\\message_{i}.db"
+        rel_key = f"message/message_{i}.db"
         try:
             conn = sqlite3.connect(f"file:{db_path}?mode=ro", uri=True)
             for row in conn.execute("SELECT user_name FROM Name2Id").fetchall():
@@ -595,7 +595,7 @@ class SessionMonitor:
         #    local_id 不全局唯一，需要同时匹配 create_time
         file_md5 = None
         for _try in range(2):
-            res_path = self.db_cache.get("message\\message_resource.db")
+            res_path = self.db_cache.get("message/message_resource.db")
             if not res_path:
                 return None
             try:
@@ -620,7 +620,7 @@ class SessionMonitor:
             except Exception as e:
                 if 'malformed' in str(e) and _try == 0:
                     print(f"  [img] resource DB malformed, 强制刷新...", flush=True)
-                    self.db_cache.invalidate("message\\message_resource.db")
+                    self.db_cache.invalidate("message/message_resource.db")
                     continue
                 print(f"  [img] 查询 message_resource 失败: {e}", flush=True)
                 return None
@@ -756,7 +756,7 @@ class SessionMonitor:
         if db_key not in self.db_cache.keys:
             return []
         enc_key = bytes.fromhex(self.db_cache.keys[db_key]["enc_key"])
-        rel_path = db_key.replace('\\', os.sep)
+        rel_path = db_key.replace('/', os.sep)
         db_path = os.path.join(DB_DIR, rel_path)
         wal_path = db_path + "-wal"
         if not os.path.exists(db_path):
@@ -1877,7 +1877,7 @@ def main():
     with open(KEYS_FILE) as f:
         keys = json.load(f)
 
-    enc_key = bytes.fromhex(keys["session\\session.db"]["enc_key"])
+    enc_key = bytes.fromhex(keys["session/session.db"]["enc_key"])
     session_db = os.path.join(DB_DIR, "session", "session.db")
 
     print("加载联系人...", flush=True)
@@ -1910,9 +1910,9 @@ def main():
     def _warmup():
         try:
             t0 = time.perf_counter()
-            warmup_keys = ["message\\message_resource.db"]
+            warmup_keys = ["message/message_resource.db"]
             for i in range(5):
-                k = f"message\\message_{i}.db"
+                k = f"message/message_{i}.db"
                 if k in keys:
                     warmup_keys.append(k)
             for k in warmup_keys: