Improve RCON maintenance response handling

[GT-610]

Summary

• share RCON command usage data between GC and fallback help
• keep inventory-maintenance responses within the Source RCON packet limit and report truncation
• tighten RCON command holder ownership and suppress third-party SDK C4819 warnings

Validation

• git diff --check
• Release build of csgo_gc

Summary by CodeRabbit

• New Features

  • RCON item commands now enforce response-size limits and clearly report total, displayed, and truncated results.
  • RCON help output is generated consistently across interfaces.

• Documentation

  • Documented response-size limits, truncation behavior, and updated examples for item-related commands.

• Bug Fixes

  • Improved handling of long RCON responses to prevent oversized output.
  • Reduced MSVC warning noise during builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: cdbb4247-c2e7-4c5d-8598-a3e69af4ea68

📥 Commits

Reviewing files that changed from the base of the PR and between bf9431e and d141258.

📒 Files selected for processing (6)

• csgo_gc/CMakeLists.txt
• csgo_gc/gc_client.cpp
• csgo_gc/gc_client.h
• csgo_gc/gc_shared.h
• csgo_gc/rcon_server.cpp
• docs/rcon.md

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📝 Walkthrough

Walkthrough

Changes

RCON behavior

Layer / File(s)	Summary
Bounded RCON responses csgo_gc/gc_client.cpp, docs/rcon.md	Large item responses are limited to one Source RCON packet and report total, shown, and truncated values.
Owned RCON command transfer csgo_gc/gc_client.cpp, csgo_gc/gc_shared.h	RCON requests are passed through an owned holder pointer and reconstructed during event handling.
Centralized command usage csgo_gc/gc_client.h, csgo_gc/gc_client.cpp, csgo_gc/rcon_server.cpp	Client and server help responses use the shared command usage list.

Build configuration

Layer / File(s)	Summary
MSVC warning configuration csgo_gc/CMakeLists.txt	MSVC builds suppress warning 4819 for the csgo_gc target.

Possibly related PRs

• GT-610/csgo-gc#16: Related RCON server and client command handling, including help command generation.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main theme: improving RCON response handling, including truncation and shared command usage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[GT-610]

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