Setup Podman and Podman Compose for local development

Add comprehensive Podman configuration for local development:

- docker-compose.yml: Main compose file with all services (PostgreSQL, RabbitMQ, API, Frontend)
- docker-compose.dev.yml: Development-specific overrides with hot-reload
- Dockerfile.api: Backend API service Dockerfile
- Dockerfile.frontend: Frontend Next.js service Dockerfile
- Updated Dockerfile: Podman-compatible production build with better layer caching
- .env.example: Environment variable template
- .dockerignore: Exclude unnecessary files from builds
- Makefile: Convenient commands for common Podman operations
- scripts/db/: Database initialization scripts directory
- Updated README.md: Comprehensive Podman setup and usage documentation

Features:
- Rootless Podman support with SELinux compatibility
- Development mode with volume mounts for hot-reload
- Health checks for service dependencies
- Proper build stage optimization
- All services networked together

scripts/db/01-init.sql

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+-- LightSaver Database Initialization Script
+-- This script runs automatically when the PostgreSQL container starts for the first time
+
+-- Create extensions if needed
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+
+-- Add your table definitions here
+-- Example:
+-- CREATE TABLE IF NOT EXISTS users (
+--   id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+--   email VARCHAR(255) UNIQUE NOT NULL,
+--   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+--   updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+-- );
+
+-- Add initial seed data here if needed

scripts/db/README.md

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+# Database Initialization Scripts
+
+SQL scripts in this directory are automatically executed when the PostgreSQL container is first initialized.
+
+## Usage
+
+- Scripts are executed in alphabetical order
+- Use numbered prefixes (01-, 02-, etc.) to control execution order
+- Place schema definitions in early scripts
+- Place seed data in later scripts
+
+## Example
+
+- `01-init.sql` - Create extensions and initial schema
+- `02-seed.sql` - Insert initial data
+- `03-indexes.sql` - Create indexes
+
+## Notes
+
+- These scripts only run on first container creation
+- To re-run, you must remove the postgres volume: `make clean` or `podman-compose down -v`