fix: improve YAML URL handling and content decoding in AppDslService

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/services/app_dsl_service.py

@@ -2,6 +2,7 @@
 import uuid
 from enum import StrEnum
 from typing import Optional, cast
+from urllib.parse import urlparse
 from uuid import uuid4
 
 import yaml  # type: ignore
@@ -103,7 +104,7 @@ def import_app(
             raise ValueError(f"Invalid import_mode: {import_mode}")
 
         # Get YAML content
-        content: bytes | str = b""
+        content: str = ""
         if mode == ImportMode.YAML_URL:
             if not yaml_url:
                 return Import(
@@ -114,12 +115,13 @@ def import_app(
             try:
                 max_size = 10 * 1024 * 1024  # 10MB
                 # tricky way to handle url from github to github raw url
-                if yaml_url.startswith("https://github.com") and yaml_url.endswith((".yml", ".yaml")):
+                host = urlparse(yaml_url).hostname
+                if host and host.endswith("github.com"):
                     yaml_url = yaml_url.replace("https://github.com", "https://raw.githubusercontent.com")
                     yaml_url = yaml_url.replace("/blob/", "/")
                 response = ssrf_proxy.get(yaml_url.strip(), follow_redirects=True, timeout=(10, 10))
                 response.raise_for_status()
-                content = response.content
+                content = response.content.decode()
 
                 if len(content) > max_size:
                     return Import(