docs: update logging section in README with additional details and examples

Author: Lasim

services/backend/README.md

@@ -200,6 +200,7 @@ DEPLOYSTACK_ENCRYPTION_SECRET=your-32-character-secret-key-here  # Required for
 DeployStack uses **Pino** logger with **Fastify** for high-performance, structured logging:
 
 **Available Log Levels** (in order of severity):
+
 - `trace` (10) - Very detailed debugging information
 - `debug` (20) - Debugging information for development
 - `info` (30) - General information (default for production)
@@ -208,11 +209,13 @@ DeployStack uses **Pino** logger with **Fastify** for high-performance, structur
 - `fatal` (60) - Fatal errors that cause application termination
 
 **Environment-based Defaults:**
+
 - **Development**: `debug` level with pretty-printed, colorized output
 - **Production**: `info` level with structured JSON output
 - **Override**: Set `LOG_LEVEL` environment variable to any level
 
 **Examples:**
+
 ```bash
 # Show all logs including debug info
 LOG_LEVEL=debug npm run dev
@@ -225,6 +228,7 @@ LOG_LEVEL=error npm run start
 ```
 
 **Log Output Formats:**
+
 - **Development**: `[2025-07-03 10:48:06.636 +0200] INFO: ✅ Database initialization completed`
 - **Production**: `{"level":30,"time":"2025-07-03T08:48:06.636Z","msg":"Database initialization completed"}`