fix(inspect): limit request body size

[vfusco]

No description provided.

[Copilot]

Pull request overview

Adds a 2 MiB request body size limit to the inspect endpoint, matching the Cartesi Machine's CMIO RX buffer size, to avoid reading oversized payloads into memory.

Changes:

• Added maxPayloadSize constant and body-size enforcement using io.LimitReader in ServeHTTP
• Added tests for payloads at and above the size limit
• Extracted startServer helper in tests

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
internal/inspect/inspect.go	Limits request body reads to 2 MiB, returning 413 for oversized payloads
internal/inspect/inspect_test.go	Adds tests for max and over-limit payloads; extracts startServer helper

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