Refactor database configuration and schema for Crypto Trading Bot Platform

- Updated `docker-compose.yml` to remove hardcoded passwords, relying on environment variables for PostgreSQL and Redis configurations.
- Modified `env.template` to reflect new password settings and ensure secure handling of sensitive information.
- Introduced a new `database/connection.py` file for improved database connection management, including connection pooling and session handling.
- Updated `database/models.py` to align with the new schema in `schema_clean.sql`, utilizing JSONB for optimized data storage.
- Enhanced `setup.md` documentation to clarify the initialization process and emphasize the importance of the `.env` file for configuration.
- Added a new `scripts/init_database.py` script for automated database initialization and verification, ensuring all tables are created as expected.

env.template

@@ -1,15 +1,15 @@
 # Database Configuration
 POSTGRES_DB=dashboard
 POSTGRES_USER=dashboard
-POSTGRES_PASSWORD=dashboard123
+POSTGRES_PASSWORD=sdkjfh534^jh
 POSTGRES_HOST=localhost
-POSTGRES_PORT=5432
-DATABASE_URL=postgresql://dashboard:dashboard123@localhost:5432/dashboard
+POSTGRES_PORT=5434
+DATABASE_URL=postgresql://dashboard:sdkjfh534^jh@localhost:5434/dashboard
 
 # Redis Configuration
 REDIS_HOST=localhost
 REDIS_PORT=6379
-REDIS_PASSWORD=
+REDIS_PASSWORD=redis987secure
 
 # OKX API Configuration
 OKX_API_KEY=your_okx_api_key_here