fix: align Confluence PAT auth type with server expectations (sooperset#549)

Change Confluence authentication type from "token" to "pat" to match
server-side expectations and maintain consistency with Jira implementation.

Previously, Confluence set auth_type="token" for personal access tokens while
the server middleware and dependency injection expected "pat". This mismatch
caused PAT authentication to fail completely in Confluence Data Center.

This change updates:
- ConfluenceConfig auth_type Literal from "token" to "pat"
- All conditionals checking auth_type from "token" to "pat"
- Aligns Confluence with Jira's existing "pat" convention

BREAKING CHANGE: Existing configurations using auth_type="token" must be
updated to auth_type="pat".

Reported-by: Anton Malyshev

Author: sergiobank

src/mcp_atlassian/confluence/client.py

@@ -56,7 +56,7 @@ def __init__(self, config: ConfluenceConfig | None = None) -> None:
                 cloud=True,  # OAuth is only for Cloud
                 verify_ssl=self.config.ssl_verify,
             )
-        elif self.config.auth_type == "token":
+        elif self.config.auth_type == "pat":
             logger.debug(
                 f"Initializing Confluence client with Token (PAT) auth. "
                 f"URL: {self.config.url}, "

src/mcp_atlassian/confluence/config.py

@@ -24,7 +24,7 @@ class ConfluenceConfig:
     """
 
     url: str  # Base URL for Confluence
-    auth_type: Literal["basic", "token", "oauth"]  # Authentication type
+    auth_type: Literal["basic", "pat", "oauth"]  # Authentication type
     username: str | None = None  # Email or username
     api_token: str | None = None  # API token used as password
     personal_token: str | None = None  # Personal access token (Server/DC)
@@ -93,7 +93,7 @@ def from_env(cls) -> "ConfluenceConfig":
                 raise ValueError(error_msg)
         else:  # Server/Data Center
             if personal_token:
-                auth_type = "token"
+                auth_type = "pat"
             elif username and api_token:
                 # Allow basic auth for Server/DC too
                 auth_type = "basic"
@@ -167,7 +167,7 @@ def is_auth_configured(self) -> bool:
             # Partial configuration is invalid
             logger.warning("Incomplete OAuth configuration detected")
             return False
-        elif self.auth_type == "token":
+        elif self.auth_type == "pat":
             return bool(self.personal_token)
         elif self.auth_type == "basic":
             return bool(self.username and self.api_token)