refactor: simplify readLog to use standard Supervisor XML-RPC API

Removed SUPERVISOR_LOGFILE environment variable and simplified readLog()
to use the standard 2-parameter XML-RPC API that relies on supervisord's
configured logfile path.

Changes:
- Removed SUPERVISOR_LOGFILE from .env.example
- Simplified SupervisorClient.readLog() to accept only offset and length
- Removed logfile path parameter and all environment variable logic
- Fixed mobile nav container padding (removed px-4 py-6)

The readLog() method now uses the standard supervisor.readLog(offset, length)
XML-RPC call, which automatically reads from the logfile path configured
in supervisord.conf.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -11,10 +11,6 @@ SUPERVISOR_PORT=9001
 # SUPERVISOR_USERNAME=user
 # SUPERVISOR_PASSWORD=pass
 
-# Optional: Path to supervisord main logfile (for reading via XML-RPC)
-# Default: /var/log/supervisor/supervisord.log
-# SUPERVISOR_LOGFILE=/var/log/supervisor/supervisord.log
-
 # Logging Configuration
 # Log level: debug, info, warn, error (default: info in prod, debug in dev)
 LOG_LEVEL=info