Reduce default log verbosity and add configurable log levels

[gsanchietti]

Many NethServer modules currently log with very high verbosity by default. During normal operations, this high log volume creates unnecessary noise, making it difficult to identify critical errors and troubleshoot system issues.

We should lower the default log verbosity for standard operations and introduce a configurable log level mechanism. This will allow administrators to temporarily increase verbosity only when actively troubleshooting an issue.

Proposed solution

Lower the default log verbosity for standard operations and introduce a configurable log level mechanism for all chatty modules. This will allow administrators to temporarily increase verbosity only when actively troubleshooting an issue.

[stephdl]

target version is ghcr.io/nethserver/core:3.22.0-dev.4