feat(ci): add goreleaser for multi-platform binary releases

[skynet2]

Summary

• Ships go-money-server and go-money-mcp-client as standalone binaries for linux/darwin (amd64+arm64) and windows (amd64) via goreleaser, attached to every GitHub Release alongside the existing docker images.
• Swaps paulhatch/semantic-version for go-semantic-release/action so conventional-commit messages auto-bump tags (feat → minor, fix/chore/perf/refactor → patch, docs/ci/style/test/build → skip). Downstream docker + helm jobs now gate on needs.version.outputs.published == 'true' on master.
• Documents MCP client setup end-to-end (docs/mcp/client-setup.md) — the stdio↔HTTP bridge, flags, $GOMONEY_TOKEN fallback, Claude Desktop / Claude Code config snippet, troubleshooting.
• Expands the README: dedicated MCP Integration section (quick-start config, tool table, docs links), full list of importers (Firefly III, Monobank, Privat24, Paribas, Revolut), binary-release install path, rules-engine pointer.
• cmd/mcp-client gains a -version flag and falls back to $GOMONEY_TOKEN when -token is unset, so secrets can stay out of shell history.

Notable details

• Per-binary ldflags: -X github.com/ft-t/go-money/pkg/boilerplate.version/commitSHA for server, -X main.version/commitSHA for mcp-client.
• Per-id archive blocks so each binary produces its own tarball/zip (10 archives per release, not 5).
• go-semantic-release default analyzer will still bump major on BREAKING CHANGE: footers or feat!: syntax. Conventional commits without !: never bump major — matches current workflow.

Test plan

• make lint — 0 issues
• go build ./... clean
• goreleaser check passes
• make goreleaser-snapshot produces 10 archives; go-money-mcp-client -version prints injected version + commit SHA
• Merge to master → verify go-semantic-release tags, goreleaser job uploads binaries to the release, docker flow still passes
• Download a release binary on macOS/linux and confirm -server + $GOMONEY_TOKEN wiring works against a live MCP server

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.80%. Comparing base (3d5c3e4) to head (9365290).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #117   +/-   ##
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  Coverage   86.80%   86.80%           
=======================================
  Files          86       86           
  Lines        7155     7155           
=======================================
  Hits         6211     6211           
  Misses        717      717           
  Partials      227      227           

Flag	Coverage Δ
unittests	86.80% <ø> (ø)

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[gemini-code-assist]

Code Review

This pull request introduces automated release management using GoReleaser, configuring builds for the server and MCP client across multiple architectures. The mcp-client has been enhanced with versioning support and the ability to read service tokens from the GOMONEY_TOKEN environment variable. Additionally, the documentation has been significantly expanded to include a detailed MCP client setup guide, updated installation instructions, and a comprehensive overview of the AI agent integration features. I have no feedback to provide as there were no review comments.