Previously, `SeedAIProvidersFromEnv` only hashed provider-level fields,
so env var key changes were silently ignored once a provider already
existed in the database.
Include bearer keys and Bedrock credentials in the canonical drift hash,
and cover multi-key, multi-provider cases so restarts now fail loudly
when the configured credentials no longer match what is stored.
When changing a key, you'll now see this in the server startup logs:
```
2026-05-29 12:29:02.674 [info] api: Encountered an error running "coder server", see "coder server --help" for more information
2026-05-29 12:29:02.674 [info] api: error: create coder API:
2026-05-29 12:29:02.674 [info] api: github.com/coder/coder/v2/cli.(*RootCmd).Server.func2
2026-05-29 12:29:02.674 [info] api: /home/coder/coder/cli/server.go:1015
2026-05-29 12:29:02.674 [info] api: - seed ai providers from env:
2026-05-29 12:29:02.674 [info] api: github.com/coder/coder/v2/enterprise/cli.(*RootCmd).Server.func1
2026-05-29 12:29:02.674 [info] api: /home/coder/coder/enterprise/cli/server.go:187
2026-05-29 12:29:02.674 [info] api: - execute transaction:
2026-05-29 12:29:02.674 [info] api: github.com/coder/coder/v2/coderd/database.(*sqlQuerier).runTx
2026-05-29 12:29:02.674 [info] api: /home/coder/coder/coderd/database/db.go:212
---> 2026-05-29 12:29:02.674 [info] api: - AI provider "vercel" already exists in the database and differs from the current environment configuration; update the provider through the API or remove the CODER_AIBRIDGE_* env vars to stop seeding it:
2026-05-29 12:29:02.674 [info] api: github.com/coder/coder/v2/coderd.SeedAIProvidersFromEnv.func1
2026-05-29 12:29:02.674 [info] api: /home/coder/coder/coderd/ai_providers_migrate.go:139
2026-05-29 12:29:02.674 [info] api: slogjson: failed to write entry: io: read/write on closed pipe
2026-05-29 12:29:02.700 [info] dlv: Stop reason: exited
2026-05-29 12:29:02.825 [info] site: ELIFECYCLE Command failed.
error: running command "develop": server did not become ready in 1m0s:
main.waitForHealthy
/home/coder/coder/scripts/develop/main.go:877
- context canceled
```
_This PR was generated with Coder Agents._
Danny Kopping
110210d7c9