keepass: fix parseContent doc comment and add importBytes ctx note

- Replace the inaccurate "Go compiler can optimise away" claim in
  parseContent's doc with an accurate explanation: callers that already
  hold a string pass it directly, while []byte callers make a single
  explicit conversion at the call site, keeping the conversion visible
  rather than hidden inside the function (100 Go Mistakes #40).
- Add a comment in importBytes explaining why ctx is not threaded into
  addAttachment or addTextEntry: both are synchronous, purely in-memory
  operations with no I/O or blocking calls that could respect cancellation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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