cpu-gpu-monitor@alexsmolya: add CPU & GPU Monitor desklet

[alexsmolya]

Adds CPU & GPU Monitor, a Cinnamon desklet showing:

• CPU utilization
• RAM usage
• AMD CPU temperature
• NVIDIA GPU utilization
• VRAM usage
• GPU temperature
• rolling history graphs

AMD CPU temperature uses Linux k10temp/zenpower hwmon sensors with a constrained CPU/package thermal-zone fallback.

NVIDIA metrics use the system-provided nvidia-smi. If NVIDIA metrics are unavailable, the GPU section degrades gracefully while CPU/RAM monitoring continues. Multi-GPU selection is not currently provided; the first returned GPU is used.

Validation:

• node tests/readers.test.js: 25/25 passed in the development repository
• official validate-spice cpu-gpu-monitor@alexsmolya: passed
• official test-spice cpu-gpu-monitor@alexsmolya: passed
• live-tested on Cinnamon 6.6.9 / X11 with AMD Ryzen 5 5600H and NVIDIA RTX 3050 Laptop GPU
• removal/reload, settings, asynchronous procfs/sysfs sampling, NVIDIA timeout/cancellation, and degraded behavior were tested

License: GPL-3.0-or-later.

[github-actions]

Best-practices scanner

This is a regex-based check for API usage that can pose security, performance or
maintainability issues, or that may already be provided by Cinnamon. Most findings
are advisory and do not automatically disqualify a pull request.

This check is not perfect and will not replace a normal review.

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Found 1 potential issue(s):

⚠️ WARNING

⚠️ hardcoded_data_dir

cpu-gpu-monitor@alexsmolya/files/cpu-gpu-monitor@alexsmolya/desklet.js:17

Gettext.bindtextdomain(UUID, GLib.get_home_dir() + "/.local/share/locale");

Avoid hardcoding .local/share in paths. Use GLib.get_user_data_dir() instead,
which respects the XDG_DATA_HOME environment variable.

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Automated pattern check.

[alexsmolya]

The automated hardcoded_data_dir recommendation is already addressed in the current branch. Gettext.bindtextdomain() now uses GLib.get_user_data_dir() + "/locale" in commit b6dc095c.