fix(api): cap the GitHub webhook request body size

[cavidelizade]

Summary

The GitHub webhook receiver read the whole request body with io.ReadAll and no size limit, before checking the signature, on a public unauthenticated route. A single large POST, or a few concurrent ones, could exhaust process memory.

Linked issues

Closes #329

Type of change

• Bug fix (fix:)

Surface

• API (apps/api/)

What changed

Wrap c.Request.Body in http.MaxBytesReader at GitHub's 25 MiB payload cap before reading, and return 413 when it's exceeded.

Test plan

• go build, go vet, go test ./... green
• Reasoning: a body over 25 MiB now fails the read with a MaxBytesError and returns 413 instead of being buffered in full

AI assistance

• AI tools were used, tool(s): Claude Code (Opus 4.8), commits carry a Co-Authored-By: trailer

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📥 Commits

Reviewing files that changed from the base of the PR and between 61bc903 and e3cc7c1.

📒 Files selected for processing (1)

• apps/api/internal/handler/integration.go

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