fix(decrypt): 修复数据库原始密钥解密与设备绑定提示

Author: 2977094657

frontend/pages/decrypt.vue

@@ -73,6 +73,9 @@
                 </svg>
                 点击按钮将自动获取【数据库】与【图片】双重密钥。您也可以手动输入已知的64位密钥（使用<a href="https://github.com/ycccccccy/wx_key" target="_blank" class="text-[#07C160] hover:text-[#06AD56]">wx_key</a>等工具获取）。
               </p>
+              <div class="mt-3 rounded-lg border border-amber-200 bg-amber-50 px-3 py-2 text-xs leading-5 text-amber-900">
+                提示：数据库密钥跟随“账号 + 设备”下发。同一账号在另一台电脑生成的聊天记录，复制到当前设备后，通常无法在当前设备重新获取原设备对应的密钥，因此也无法直接解密。
+              </div>
             </div>
 
             <!-- 数据库路径输入 -->

src/wechat_decrypt_tool/routers/decrypt.py

@@ -14,7 +14,12 @@
 from ..logging_config import get_logger
 from ..path_fix import PathFixRoute
 from ..key_store import upsert_account_keys_in_store
-from ..wechat_decrypt import WeChatDatabaseDecryptor, decrypt_wechat_databases, scan_account_databases_from_path
+from ..wechat_decrypt import (
+    WeChatDatabaseDecryptor,
+    build_decrypt_result_message,
+    decrypt_wechat_databases,
+    scan_account_databases_from_path,
+)
 
 logger = get_logger(__name__)
 
@@ -76,6 +81,7 @@ async def decrypt_databases(request: DecryptRequest):
             "message": results["message"],
             "processed_files": results["processed_files"],
             "failed_files": results["failed_files"],
+            "failure_details": results.get("failure_details", []),
             "account_results": results.get("account_results", {}),
         }
 
@@ -159,6 +165,7 @@ async def generate_progress():
         fail_count = 0
         processed_files: list[str] = []
         failed_files: list[str] = []
+        failure_details: list[dict] = []
         account_results: dict = {}
         overall_current = 0
 
@@ -181,6 +188,7 @@ async def generate_progress():
             account_success = 0
             account_processed: list[str] = []
             account_failed: list[str] = []
+            account_failure_details: list[dict] = []
 
             for db_info in dbs:
                 if await request.is_disconnected():
@@ -232,11 +240,20 @@ async def generate_progress():
                     status = "success"
                     msg = "解密成功"
                 else:
+                    failure_detail = {
+                        "account": account,
+                        "file": db_path,
+                        "name": db_name,
+                        "code": str(decryptor.last_error_code or "").strip(),
+                        "reason": str(decryptor.last_error_message or "").strip() or "解密失败",
+                    }
                     account_failed.append(db_path)
+                    account_failure_details.append(failure_detail)
                     failed_files.append(db_path)
+                    failure_details.append(failure_detail)
                     fail_count += 1
                     status = "fail"
-                    msg = "解密失败"
+                    msg = failure_detail["reason"]
 
                 yield _sse(
                     {
@@ -261,6 +278,7 @@ async def generate_progress():
                 "output_dir": str(account_output_dir),
                 "processed_files": account_processed,
                 "failed_files": account_failed,
+                "failure_details": account_failure_details,
             }
 
             # Build cache table (keep behavior consistent with the POST endpoint).
@@ -307,9 +325,15 @@ async def generate_progress():
             "success_count": success_count,
             "failure_count": total_databases - success_count,
             "output_directory": str(base_output_dir.absolute()),
-            "message": f"解密完成: 成功 {success_count}/{total_databases}",
+            "message": build_decrypt_result_message(
+                total_databases=total_databases,
+                success_count=success_count,
+                failed_count=total_databases - success_count,
+                failure_details=failure_details,
+            ),
             "processed_files": processed_files,
             "failed_files": failed_files,
+            "failure_details": failure_details,
             "account_results": account_results,
         }