Add full SEO optimization for Spanglish social and language events

- Add comprehensive metadata to root layout with Open Graph, Twitter cards
- Create dynamic sitemap.ts for all pages and events
- Create robots.ts with proper allow/disallow rules
- Add JSON-LD Event structured data to event detail pages
- Add page-specific metadata to events, community, contact, FAQ pages
- Add FAQ structured data schema
- Update footer with local SEO text for Asunción, Paraguay
- Add web manifest for mobile SEO
- Create 404 page with proper noindex
- Optimize image alt text and add lazy loading
- Add NEXT_PUBLIC_SITE_URL env variable
- Add about/ folder to gitignore

backend/scripts/migrate-users-nullable-password.sql

@@ -0,0 +1,39 @@
+-- Migration: Make password column nullable for Google OAuth users
+-- Run this on your production SQLite database:
+-- sqlite3 /path/to/spanglish.db < migrate-users-nullable-password.sql
+
+-- SQLite doesn't support ALTER COLUMN, so we need to recreate the table
+
+-- Step 1: Create new table with correct schema (password is nullable)
+CREATE TABLE users_new (
+  id TEXT PRIMARY KEY,
+  email TEXT NOT NULL UNIQUE,
+  password TEXT,  -- Now nullable for Google OAuth users
+  name TEXT NOT NULL,
+  phone TEXT,
+  role TEXT NOT NULL DEFAULT 'user',
+  language_preference TEXT,
+  is_claimed INTEGER NOT NULL DEFAULT 1,
+  google_id TEXT,
+  ruc_number TEXT,
+  account_status TEXT NOT NULL DEFAULT 'active',
+  created_at TEXT NOT NULL,
+  updated_at TEXT NOT NULL
+);
+
+-- Step 2: Copy all existing data
+INSERT INTO users_new (id, email, password, name, phone, role, language_preference, is_claimed, google_id, ruc_number, account_status, created_at, updated_at)
+SELECT id, email, password, name, phone, role, language_preference, is_claimed, google_id, ruc_number, account_status, created_at, updated_at
+FROM users;
+
+-- Step 3: Drop old table
+DROP TABLE users;
+
+-- Step 4: Rename new table
+ALTER TABLE users_new RENAME TO users;
+
+-- Step 5: Recreate indexes
+CREATE UNIQUE INDEX IF NOT EXISTS users_email_idx ON users(email);
+CREATE INDEX IF NOT EXISTS users_google_id_idx ON users(google_id);
+
+-- Done! Google OAuth users can now be created without passwords.