Fix prometheous inactive alerts and print version

[thibaut1304]

Description

Fixed the counting of "inactive" alerts
Previously: only firing and pending alerts were counted from /api/v1/alerts

Fix: Added a call to /api/v1/rules to iterate through groups[].rules[] and filter those with state: inactive.
Corrected display in the badge ({{ count }}) and in the text (x inactive alerts).

Added the Prometheus version (buildinfo) on desktop only.
New query to /api/v1/status/buildinfo.
Mobile detected via window.matchMedia.

Visual UX improvement
The API status is initialized to null (instead of an empty object), which prevents the badge from flashing or alerts with a default value of 0 at startup.

For your information:
Note on Prometheus Basic Authentication
Limitation of Prometheus + Basic Auth + CORS:
When using Authorization: Basic, the browser first sends an OPTIONS request (pre-flight CORS) without an authentication header. Prometheus rejects this with a 401 without CORS headers, thus blocking the actual request.
Result: It is impossible to use the Prometheus API directly from the browser with Basic Auth.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

[thibaut1304]

For the commit: f53e3f6
The 2 rules in the wireguard group were personal tests, they do not work and therefore we can consider them as inactive!

[thibaut1304]