Add dog command with random picture feature

[nekeal]

Summary

Add /dog hybrid command that fetches random dog pictures from dog.ceo (https://dog.ceo) API.

Changes

• src/europython_discord/dog/dogclient.py — async HTTP client wrapping the Dog API, returns a random image URL or None on failure
• src/europython_discord/dog/config.py — DogConfig model with configurable error messages
• src/europython_discord/dog/cog.py — DogCog with /dog hybrid command; sends an embed on success or a random error message on failure
• src/europython_discord/bot.py — registers DogCog with optional DogConfig
• tests/dog/test_cog.py — unit tests for success and error paths
• Config files — prod-config.toml and test-config.toml gain a [dog] section

Notes

• Uses @commands.hybrid_command — works both as $dog prefix and /dog slash command

Resolves #341

[NMertsch]

Is this used?

[NMertsch]

That's a lot of setup and indirection for such simple tests. Can this be simplified?

[NMertsch]

Hi @nekeal, sorry for the late response, I hope to be more responsive from now on.

Thank you for your work, I'm looking forward to participants' reaction! :)

Here is some feedback. My comments on the code are optional as well.

Required:

• Please add an alt text to the posted image, e.g. "Random dog of breed [...]" (or just "Random dog image").
• As discussed on Discord, let's restrict this command to a channel which can be configured in the config file (e.g. channel = "animal-appreciation-channel").
• Please add a configurable per-user timeout to avoid spam. It's probably enough to keep a dict[userId, lastTimestamp] inside the cog class, and check/update the lastTimestamp on each usage.

Ideas (optional):

• I think we should add the image source in some way (either https://dog.ceo/, or the actual image URL).
• Make the source URL configurable.
• Maybe add other animal generators as well, e.g. https://http.cat/ for /cat? A toml table could work as config.