refactor(types): regenerate database types from canonical schema; drop TODO(types) join casts

Regenerate types/database.ts from a local Supabase built from the canonical
scripts/schema.sql. The running dev DB was stale (missing the 'stripe'
payment_platform value, members_with_permission, spaces.host_requires_card,
payments.link_status, dues_payment_methods.space_id), so it was rebuilt from
schema.sql first.

With real relationship metadata the 11 `as unknown as … // TODO(types)` join
casts are no longer needed:
- me portal, session-attendance, member-certifications, equipment-reservations:
  narrow the action result with `'data' in res` instead of a blanket cast.
- stripe / door embeds read the now-typed relation directly.
- completeSession + listEquipmentReservations route the embedded-select query
  through the fully-typed createClient() rather than the wide ServerSupabase gate
  client (the pattern documented in auth-helpers.ts); equipment disambiguates its
  two space_members FKs with an explicit !fkey hint.

Collapse the hand-maintained governance rows/enums in types/domain/governance.ts
into Tables<>/Enums<> aliases.

Tighten duesPaymentMethodSchema.platform to the DUES_LINK_PLATFORMS literal union
(the old `as unknown as [string,...]` erased it), which the now-correct
payment_platform enum requires.

The hand-added class_signup_tx / class_cancel_tx RPC entries are now generated
natively.

typecheck 0 · lint 0 errors · 645 tests · build ok

lib/actions/classes/signups.ts

@@ -43,10 +43,7 @@ export async function signUpForClass(input: unknown) {
     .eq('space_id', member.space_id)
     .maybeSingle()
   if (!session) return { error: 'Session not found' }
-  // TODO(types): remove after regenerating types/database.ts (missing FK relationship metadata)
-  const cls = (session as unknown as {
-    classes?: { title: string | null; capacity: number | null; is_active: boolean; required_form_id: string | null } | null
-  }).classes
+  const cls = session.classes
   if (cls && cls.is_active === false) return { error: 'This class is no longer available.' }
 
   const { data: isMgr } = await supabase.rpc('user_has_permission', {