Remove ext supabase command and Supabase launch support

[stahnma]

Summary

Supabase is no longer supported, so this removes the fly ext supabase command and all Supabase references from the codebase.

• Delete the internal/command/extensions/supabase/ package (supabase, list, status, dashboard, destroy) and unregister it in extensions.go.
• Remove Supabase from the launch planner:
  • plan/postgres.go — drop the SupabasePostgres field, its Provider() branch, and the SupabasePostgresPlan type + methods.
  • describe_plan.go — remove the plan case and describeSupabasePostgresPlan.
  • launch_databases.go — remove the now-defunct "Supabase Postgres is no longer supported" notice.
  • cmd.go — drop SupabasePostgres from the HasPostgres check.
  • state.go — validateExtensions only did Supabase plan-limit validation, so it's now a no-op stub; dropped the newly-unused errors, prompt, extensions_core, and flag imports.

Notes

• The generated gql AddOnType enum still carries the server-side supabase value and is left untouched (it's regenerated from the server schema; nothing in flyctl references it anymore).
• Behavioral change: if a launch manifest ever contains a supabase_postgres block, flyctl now silently ignores it (Go drops unknown JSON fields) instead of printing the deprecation message — consistent with "no longer supported."

Test plan

• go build ./... — passes
• go vet ./internal/command/launch/... ./internal/command/extensions/... — clean

[dangra]

yay!

[Copilot]

Pull request overview

Removes all CLI and launch-planner support for Supabase now that Supabase is no longer supported, including deleting the fly ext supabase command tree and eliminating Supabase-specific launch planning/validation paths.

Changes:

• Deleted the internal/command/extensions/supabase command package and unregistered it from the extensions root command.
• Removed Supabase Postgres support from the launch plan model and its plan description output.
• Removed Supabase-specific launch-time messaging and validation (leaving validateExtensions as a no-op stub).

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/command/launch/state.go	Removes Supabase plan-limit validation logic; validateExtensions now returns nil.
internal/command/launch/plan/postgres.go	Drops SupabasePostgres from PostgresPlan and removes SupabasePostgresPlan type/methods.
internal/command/launch/launch_databases.go	Removes the “Supabase Postgres is no longer supported” notice during database creation.
internal/command/launch/describe_plan.go	Removes Supabase plan description branch/function; unrecognized providers now fall back to <none>.
internal/command/launch/cmd.go	Updates HasPostgres to exclude removed Supabase Postgres plan field.
internal/command/extensions/supabase/supabase.go	Deleted: removes the fly ext supabase root command.
internal/command/extensions/supabase/status.go	Deleted: removes Supabase status subcommand.
internal/command/extensions/supabase/list.go	Deleted: removes Supabase list subcommand.
internal/command/extensions/supabase/destroy.go	Deleted: removes Supabase destroy subcommand.
internal/command/extensions/supabase/dashboard.go	Deleted: removes Supabase dashboard subcommand.
internal/command/extensions/extensions.go	Unregisters Supabase extension command and removes its import.

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