fix(OSQUERY-010-2): CU-17tkuw5wp49 kafka_producer.cpp uses _WIN32 instead of the canonical WIN32 guard

[flamingo]

Closes findings from rule OSQUERY-010-2 — kafka_producer.cpp uses _WIN32 instead of the canonical WIN32 guard.

Draft — this is a starting point, not a finished change. The fix required judgment, so read it before trusting it.

#	Fix confidence	Finding	Location
1	🟢 90 high	kafka_producer.cpp uses _WIN32 instead of the canonical WIN32 guard	plugins/logger/kafka_producer.cpp:17

What changed — and what was deliberately left — is explained per finding as inline review comments on the lines each finding touched.

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Run: https://product-hub.flamingo.so/admin/code-review
Run id: cb1fa104-eac6-46a7-aba8-90d794c59386

Merging this PR is recorded as acceptance of the rule that produced it;
closing it unmerged is recorded as rejection. Both feed rule health, so
closing a wrong suggestion is useful rather than merely tidy.

ClickUp task: CU-17tkuw5wp49 Osquery review findings sweep (8 PRs)

[flamingo]

🦩 What this fix changed, finding by finding

1 finding(s) fixed in this draft — 1 explained inline on the diff.

[flamingo]

🦩 🟠 kafka_producer.cpp uses _WIN32 instead of the canonical WIN32 guard

Changed the platform guard in the top-of-file include block from #ifdef _WIN32 / #elif defined _unix_ to #ifdef WIN32 / #else, matching the canonical OSQUERY-010-2 WIN32 guard and ensuring <unistd.h> is included on all non-Windows builds instead of only on a never-defined _unix_ macro.

🤖 Prompt for AI agents

In plugins/logger/kafka_producer.cpp around line 17, review and complete this code-review fix: kafka_producer.cpp uses _WIN32 instead of the canonical WIN32 guard.
What the draft fix changed: Changed the platform guard in the top-of-file include block from `#ifdef _WIN32` / `#elif defined _unix_` to `#ifdef WIN32` / `#else`, matching the canonical OSQUERY-010-2 `WIN32` guard and ensuring `<unistd.h>` is included on all non-Windows builds instead of only on a never-defined `_unix_` macro.
Verify the change is correct and complete; do not refactor unrelated code.

fix confidence: 🟢 90 high — react 👍/👎 to teach the reviewer