fix(ram_signature): decode query parameters in signed headers

Updated the query parameter handling in get_agentrun_signed_headers to decode both keys and values using unquote. This ensures that the headers are correctly signed when special characters are present in the query string.

修复(ram_signature)：在签名头中解码查询参数
更新 get_agentrun_signed_headers 中的查询参数处理，以使用 unquote 解码键和值。这确保在查询字符串中存在特殊字符时，头部能够正确签名。

Change-Id: If1ca01053877ec382044ffc84b4db0e81ecf0610
Signed-off-by: OhYee <oyohyee@oyohyee.com>

Author: OhYee

agentrun/utils/ram_signature/signer.py

@@ -12,7 +12,7 @@
 import hashlib
 import hmac
 from typing import Optional
-from urllib.parse import quote, urlparse
+from urllib.parse import quote, unquote, urlparse
 
 ALGORITHM = "AGENTRUN4-HMAC-SHA256"
 UNSIGNED_PAYLOAD = "UNSIGNED-PAYLOAD"
@@ -156,7 +156,7 @@ def get_agentrun_signed_headers(
         for pair in parsed.query.split("&"):
             if "=" in pair:
                 k, v = pair.split("=", 1)
-                query_params[k] = v
+                query_params[unquote(k)] = unquote(v)
 
     now = sign_time if sign_time is not None else datetime.now(timezone.utc)
     if now.tzinfo is None: