fix: add baseUrl to Octokit initialization in update_claude_comment (#157)

* fix: add baseUrl to Octokit initialization in update_claude_comment

Fixes Bad credentials error on GitHub Enterprise Server by passing
GITHUB_API_URL as baseUrl when initializing Octokit, consistent with
other Octokit instances in the codebase.

Fixes #156
Related to #107

Co-authored-by: ashwin-ant <ashwin-ant@users.noreply.github.com>

* fix: pass GITHUB_API_URL as env var to MCP server

Update the MCP server initialization to pass GITHUB_API_URL as an
environment variable, allowing it to work correctly with GitHub
Enterprise Server instances.

Co-authored-by: ashwin-ant <ashwin-ant@users.noreply.github.com>

* fix: import GITHUB_API_URL from config in install-mcp-server

Use the centralized GITHUB_API_URL constant from src/github/api/config.ts instead of reading directly from process.env when passing environment variables to the MCP server. This ensures consistency with how the API URL is handled throughout the codebase.

Co-authored-by: ashwin-ant <ashwin-ant@users.noreply.github.com>

* fix

---------

Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: ashwin-ant <ashwin-ant@users.noreply.github.com>

src/mcp/github-file-ops-server.ts

@@ -466,6 +466,7 @@ server.tool(
 
       const octokit = new Octokit({
         auth: githubToken,
+        baseUrl: GITHUB_API_URL,
       });
 
       const isPullRequestReviewComment =