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>

components/layout/Navbar.tsx

@@ -117,7 +117,7 @@ export function Navbar() {
       {/* Mobile Menu Drawer */}
       {mobileMenuOpen && (
         <div className="md:hidden fixed inset-0 top-16 z-50">
-          <div className="container px-4 py-6">
+          <div className="container">
             <nav className="flex flex-col gap-2 bg-background/95 backdrop-blur-md rounded-lg p-4">
               {navItems.map((item) => (
                 <Link key={item.href} href={item.href}>