- Instead of relying on JSON to convert the struct to map, use
`reflect` to do this conversion. Also simplify it a bit by only passing
one variable to the template.
- This avoids issues where the conversion to JSON causes changes in
the value, for example huge numbers are converted to its scientific
notation but are consequently not converted back when being displayed.
- Adds unit tests.
- Resolves an issue where the amount of comments is being displayed in
scientific notation on Codeberg.
Before, Gitea shows the database table stats on the `admin dashboard`
page.
It has some problems:
* `count(*)` is quite heavy. If tables have many records, this blocks
loading the admin page blocks for a long time
* Some users had even reported issues that they can't visit their admin
page because this page causes blocking or `50x error (reverse proxy
timeout)`
* The `actions` stat is not useful. The table is simply too large. Does
it really matter if it contains 1,000,000 rows or 9,999,999 rows?
* The translation `admin.dashboard.statistic_info` is difficult to
maintain.
So, this PR uses a separate page to show the stats and removes the
`actions` stat.
## ⚠️ BREAKING
The `actions` Prometheus metrics collector has been removed for the
reasons mentioned beforehand.
Please do not rely on its output anymore.
