Rework things into one config

[comstud]

• one config to rule them all
• Have fletchling load all active nests from DB and that's it. no filtering. Reserve mucking around with what you want to be active for external tools or API calls.
• fix missing db rows.Close()s. Oops.
• add refresh=1 query param to /api/config/reload to compute spawnpoint counts if any are unknown and re-run filters before reloading nests. this can run for a long time if there are a lot nests in the DB as it will also filter overlapping nests according to max overlap percent.
• add spawnpoints=all query param to /api/config/reload to re-compute spawnpoints for ALL nests. This also re-runs all filters before reloading nests.
• add concurrency=# query param to /api/config/reload to change amount of concurrency if refreshing. defaults to 4.
• have the importer error if migrations need to be run. fletchling should be restarted to run them first before using the importer tool.
• require go 1.22
• keep track of area parents and use that as part of area_name. This allows configuring the webhooks exactly like Golbat

[comstud]

I'm not really expecting this to be reviewed. Tons of changes here and I'm just going to merge it later tonight. I think this is good enough. There will be questions. Docs will need to be improved. But I can work on those when I figure out what the questions are going to be.