Set up proper DB migrations and fix remaining mobile responsive issues

Migrations:
- drizzle.config.ts: add out: './drizzle' so drizzle-kit generate writes
  SQL migration files instead of only supporting push
- drizzle/0000_glossy_magneto.sql: initial migration capturing all 9
  current tables (users, accounts, sessions, verification_tokens,
  sso_providers, clients, businesses, invoices, invoice_items)
- src/server/db/migrate.ts: programmatic runner using drizzle-orm's
  migrate() — tracks applied migrations in __drizzle_migrations,
  safe to run on every deploy
- package.json: db:migrate now runs the programmatic runner instead of
  drizzle-kit migrate (CLI requires devDeps at runtime)
- start.sh: replace drizzle-kit push with bun src/server/db/migrate.ts
- Dockerfile: copy drizzle/ folder into the runner image so migrations
  are available at container startup

Mobile fixes:
- data-table.tsx: pagination buttons grow from 32px to 40px on mobile
  (h-10 w-10 md:h-8 md:w-8) to meet 44px touch-target guidelines
- floating-action-bar.tsx: stack left-content + action buttons to column
  layout on narrow screens (flex-col sm:flex-row), reduce padding on
  mobile (p-3 sm:p-4)
- revenue-chart.tsx: responsive chart height (h-48 md:h-64) so the chart
  doesn't consume too much vertical space on small screens

https://claude.ai/code/session_012sqEgNQpx676isepeoX4Mi

src/components/layout/floating-action-bar.tsx

@@ -72,7 +72,7 @@ export function FloatingActionBar({
         )}
       >
         <Card className="hover-lift bg-card border-border border shadow-lg">
-          <CardContent className="flex items-center justify-between p-4">
+          <CardContent className="flex flex-col gap-3 p-3 sm:flex-row sm:items-center sm:justify-between sm:p-4">
             {/* Left content */}
             {leftContent && (
               <div className="text-card-foreground animate-fade-in flex flex-1 items-center gap-3">