feat(metrics): add total and per channel vods duration

[Entrivax]

Small PR to add the total vods duration to the metrics. I was wondering how days (months or years) of vods I had on my instance, so I tried to add it to the metrics export since it didn't seem very complex to add.

Visualization with Netdata of these exported values:

• Per channel (stacked bars)
  
  Per channel (pie)
  
• Total (simple line)
  

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: ef64d5b7-b872-4208-9c2e-78595efb06fb

📥 Commits

Reviewing files that changed from the base of the PR and between 0a65dea and 72a73c0.

📒 Files selected for processing (1)

• internal/metrics/metrics.go

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Walkthrough

Adds per-channel and total VOD duration metrics to the metrics system. Introduces two new gauge metrics (totalVodsDuration and channelVodDuration) to the Metrics struct, initializes them in NewService with Prometheus registration, and extends GatherMetrics to compute per-channel durations and aggregate totals.

Changes

Cohort / File(s)	Summary
VOD Duration Metrics internal/metrics/metrics.go	Adds totalVodsDuration and channelVodDuration fields to Metrics struct; initializes both as Prometheus gauges in NewService with "total_vods_duration_seconds" and "channel_vod_duration_seconds" names; registers metrics via MustRegister; extends GatherMetrics to compute per-channel VOD durations by summing vod.Duration values and sets both gauge metrics accordingly.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main changes: adding total and per-channel VOD duration metrics to the metrics system.
Description check	✅ Passed	The description is directly related to the changeset, explaining the motivation for adding VOD duration metrics and providing visualizations of how the metrics are used.

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[Entrivax]

Now that I think about it, I should probably add the storage distribution that we already have in the admin overview.

[Zibbp]

looks good, thanks