Refactor team API keys to sqlc

[jakubno]

Note

Switches team API key CRUD to sqlc, adds create/delete queries, and removes the ent TeamAPIKey schema and edges, updating handlers, seeds, and tests accordingly.

• Backend/API:
  • Replace ent usage with sqlc in handlers/apikey.go (create/delete flows, not-found handling) and handlers/teams.go (CLI key creation).
  • Update team/apikeys.go to use db/client + sqlc CreateTeamAPIKey.
• Database (sqlc):
  • Add CreateTeamAPIKey and DeleteTeamAPIKey queries and generated code.
• Models/Schema (ent):
  • Remove TeamAPIKey schema and all generated code; drop related edges from Team and User entities and associated clients/mutations/queries.
• Tooling/Deps:
  • Add packages/db module and pgx deps to go.mod files.
• Seeding/Local Dev/Tests:
  • Switch seed scripts and local-dev seeding to sqlc client for API key insertion.
  • Adjust field names in responses (e.g., ApiKeyPrefix/Length/Mask*).

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[linear]

ENG-3170 Refactor Team API keys to SQLC