feat: improved settings via env variables

[dcramer]

Validate SENTRY_HOST to only accept hostname (e.g. "sentry.io"). Support SENTRY_URL for URLs (e.g. "https://sentry.io", "http://localhost:8000") - entirely because I'm tired of support tickets.

Remove deprecated SENTRY_AUTH_TOKEN.

Rename MCP_HOST to MCP_URL.

🤖 Generated with Claude Code

[codecov]

Codecov Report

Attention: Patch coverage is 53.48837% with 40 lines in your changes missing coverage. Please review.

Project coverage is 59.46%. Comparing base (74abebb) to head (f398776).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/mcp-server/src/index.ts	0.00%	24 Missing ⚠️
packages/mcp-server/src/utils/url-utils.ts	68.18%	14 Missing ⚠️
...ges/mcp-cloudflare/src/server/lib/mcp-transport.ts	0.00%	1 Missing ⚠️
packages/mcp-cloudflare/src/server/routes/chat.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
- Coverage   59.69%   59.46%   -0.23%     
==========================================
  Files          78       77       -1     
  Lines        6634     6580      -54     
  Branches      493      495       +2     
==========================================
- Hits         3960     3913      -47     
+ Misses       2674     2667       -7     

Flag	Coverage Δ
evals	?
unittests	59.46% <53.48%> (+0.02%)	⬆️

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[graphite-app]

The comment for SENTRY_HOST is inconsistent with the implementation. According to the PR changes, SENTRY_HOST should only accept hostnames without protocols, while SENTRY_URL should be used for full URLs. The comment should be updated to:

SENTRY_HOST=sentry.io  # For self-hosted Sentry instances (hostname only, no protocol)

Additionally, consider adding a line for SENTRY_URL to show both options:

SENTRY_URL=https://sentry.io  # Alternative to SENTRY_HOST, accepts full URLs with protocol

Suggested change

	SENTRY_HOST=sentry.io # For self-hosted Sentry instances (hostname or full URL)
	SENTRY_HOST=sentry.io # For self-hosted Sentry instances (hostname only, no protocol)
	SENTRY_URL=https://sentry.io # Alternative to SENTRY_HOST, accepts full URLs with protocol

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