feat: implement merchant dashboard, secure auth, and short_id system

- Added dedicated merchant dashboard with analytics and transactions
- Implemented API Key based authentication for merchants
- Introduced 8-character Short IDs for merchants to use in URLs
- Refactored checkout and payment intent APIs to support multi-gateway
- Enhanced Landing Page with Merchant Portal access and marketing copy
- Fixed Next.js 15 async params build issues
- Updated internal branding to P2CGateway
- Added AyrisTech credits to footer

docs/db_schema.sql

@@ -5,8 +5,14 @@ CREATE TABLE admin_users (
     created_at TIMESTAMPTZ DEFAULT NOW()
 );
 
--- Register initial admin (User should replace this or add via dashboard)
--- INSERT INTO admin_users (email) VALUES ('your-email@example.com');
+-- Merchants (Firms) table
+CREATE TABLE merchants (
+    id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
+    name TEXT NOT NULL,
+    api_key TEXT UNIQUE DEFAULT encode(gen_random_bytes(32), 'hex'),
+    webhook_url TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
 
 -- Transactions table
 CREATE TABLE transactions (
@@ -20,18 +26,27 @@ CREATE TABLE transactions (
     customer_name TEXT,
     customer_phone TEXT,
     callback_url TEXT,
+    merchant_id UUID REFERENCES merchants(id),
     metadata JSONB DEFAULT '{}'::jsonb
 );
 
 -- Enable RLS
 ALTER TABLE transactions ENABLE ROW LEVEL SECURITY;
+ALTER TABLE merchants ENABLE ROW LEVEL SECURITY;
 
 -- Create policy for admins to read all
 CREATE POLICY "Admins can read all transactions" ON transactions
     FOR SELECT
     USING (auth.jwt() ->> 'email' IN (SELECT email FROM admin_users));
 
+CREATE POLICY "Admins can manage merchants" ON merchants
+    USING (auth.jwt() ->> 'email' IN (SELECT email FROM admin_users));
+
 -- Create policy for service role to manage all
-CREATE POLICY "Service role can manage all" ON transactions
+CREATE POLICY "Service role can manage all transactions" ON transactions
+    USING (true)
+    WITH CHECK (true);
+
+CREATE POLICY "Service role can manage all merchants" ON merchants
     USING (true)
     WITH CHECK (true);