[Confluence] Fix CodeQL incomplete URL substring sanitization

Use urlparse to extract and check the hostname directly instead of
naive substring matching, preventing spoofing via paths like
evil.com/atlassian.net/...

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

Author: Zircoz

atlassian/confluence/__init__.py

@@ -5,6 +5,8 @@
 This package provides both Cloud and Server implementations of the Confluence API.
 """
 
+from urllib.parse import urlparse
+
 from .cloud import Cloud as ConfluenceCloud
 from .server import Server as ConfluenceServer
 
@@ -21,7 +23,12 @@ def __init__(self, url, *args, **kwargs):
         # Priority: explicit cloud= kwarg > URL-based heuristic
         is_cloud = kwargs.get("cloud")
         if is_cloud is None:
-            is_cloud = "atlassian.net" in url or "jira.com" in url or "api.atlassian.com" in url
+            hostname = urlparse(url).hostname or ""
+            is_cloud = (
+                hostname == "atlassian.net" or hostname.endswith(".atlassian.net")
+                or hostname == "jira.com" or hostname.endswith(".jira.com")
+                or hostname == "api.atlassian.com" or hostname.endswith(".api.atlassian.com")
+            )
         if is_cloud:
             impl = ConfluenceCloud(url, *args, **kwargs)
         else: