Add initial project structure with core functionality for book and stationery uploads

- Created main application entry point in `main.go`.
- Added configuration management in `config/config.go` and tests in `config/config_test.go`.
- Implemented handlers for book and stationery uploads in `handlers/book.go` and `handlers/stationery.go`, including validation logic.
- Established database connection and services in `services/database.go` and `services/book_service.go`.
- Defined models for books and stationery in `models/book.go` and `models/stationery.go`.
- Set up Firebase integration for image uploads in `services/firebase.go`.
- Created migration scripts for database schema in `migrations/001_create_tables.sql` and subsequent updates.
- Added CORS and error handling middleware.
- Included comprehensive tests for handlers, services, and utilities.
- Documented API endpoints and usage in `README.md` and migration instructions in `migrations/README.md`.
- Introduced `.gitignore` to exclude unnecessary files and directories.
- Added Go module support with `go.mod` and `go.sum` files.
- Implemented utility functions for slug generation and validation in `utils/slug.go` and `utils/validation.go`.

scripts/verify_schema.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# Load environment variables from .env or .env.local
+if [ -f .env ]; then
+    export $(grep -v '^#' .env | grep -v '^$' | xargs)
+elif [ -f .env.local ]; then
+    export $(grep -v '^#' .env.local | grep -v '^$' | xargs)
+else
+    echo "Error: No .env or .env.local file found"
+    exit 1
+fi
+
+# Check if required variables are set
+if [ -z "$DB_HOST" ] || [ -z "$DB_PORT" ] || [ -z "$DB_USER" ] || [ -z "$DB_NAME" ]; then
+    echo "Error: Required database environment variables not set"
+    exit 1
+fi
+
+echo "Verifying database schema..."
+echo "Connecting to: $DB_HOST:$DB_PORT/$DB_NAME as $DB_USER"
+echo ""
+
+# Verify books table
+echo "=== Checking books table ==="
+PGPASSWORD="$DB_PASSWORD" psql -h "$DB_HOST" -p "$DB_PORT" -U "$DB_USER" -d "$DB_NAME" -c "\d books" 2>&1
+
+if [ $? -eq 0 ]; then
+    echo "✓ books table exists"
+else
+    echo "✗ books table not found"
+fi
+
+echo ""
+
+# Verify stationery table
+echo "=== Checking stationery table ==="
+PGPASSWORD="$DB_PASSWORD" psql -h "$DB_HOST" -p "$DB_PORT" -U "$DB_USER" -d "$DB_NAME" -c "\d stationery" 2>&1
+
+if [ $? -eq 0 ]; then
+    echo "✓ stationery table exists"
+else
+    echo "✗ stationery table not found"
+fi
+
+echo ""
+
+# Verify indexes
+echo "=== Checking indexes ==="
+PGPASSWORD="$DB_PASSWORD" psql -h "$DB_HOST" -p "$DB_PORT" -U "$DB_USER" -d "$DB_NAME" -c "
+SELECT 
+    tablename,
+    indexname,
+    indexdef
+FROM pg_indexes 
+WHERE schemaname = 'public' 
+AND (tablename = 'books' OR tablename = 'stationery')
+ORDER BY tablename, indexname;
+" 2>&1
+
+echo ""
+echo "Schema verification complete!"
+