feat: complete launch & marketing layer

- Add marketing pages: blog, changelog, roadmap, waitlist, security, maintenance
- Add GDPR cookie consent banner with preference modal
- Add referral system with API routes for code generation/tracking
- Add waitlist API with referral support
- Add PWA support: manifest, service worker, install prompt
- Add onboarding flow with 6-step guided tour
- Add in-app notification center with bell dropdown
- Add admin launch checklist (32 items across 8 categories)
- Update landing page with trust badges
- Add Open Graph image and favicon
- Configure ESLint for PWA install patterns
- Add LAUNCH_CHECKLIST.md with go-to-market guide

Supabase migrations for:
- blog_posts and blog_categories tables
- waitlist_signups table
- roadmap_items table
- launch_checklist_items table

supabase/migrations/XXX_waitlist_table.sql

@@ -0,0 +1,30 @@
+-- Waitlist and Early Access Signup System
+-- Migration for Route Commerce
+
+CREATE TABLE IF NOT EXISTS waitlist (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    email TEXT UNIQUE NOT NULL,
+    name TEXT,
+    referral_source TEXT,
+    referred_by TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    status TEXT DEFAULT 'pending' CHECK (status IN ('pending', 'converted', 'archived'))
+);
+
+-- Index for email lookups
+CREATE INDEX IF NOT EXISTS idx_waitlist_email ON waitlist(email);
+CREATE INDEX IF NOT EXISTS idx_waitlist_status ON waitlist(status);
+CREATE INDEX IF NOT EXISTS idx_waitlist_created ON waitlist(created_at DESC);
+
+-- Grant permissions
+GRANT SELECT, INSERT ON waitlist TO anon;
+GRANT SELECT, INSERT ON waitlist TO authenticated;
+GRANT SELECT, INSERT ON waitlist TO service_role;
+
+-- Comment on table
+COMMENT ON TABLE waitlist IS 'Early access signup for Route Commerce platform';
+COMMENT ON COLUMN waitlist.email IS 'Unique email address';
+COMMENT ON COLUMN waitlist.name IS 'Optional full name';
+COMMENT ON COLUMN waitlist.referral_source IS 'How they heard about us';
+COMMENT ON COLUMN waitlist.referred_by IS 'Email of person who referred them';
+COMMENT ON COLUMN waitlist.status IS 'pending, converted (signed up), archived';