feat(cli): replace ugly ASCII boxes with beautiful colored status output

Replaced all ASCII box characters (┌─┐│└┘) with modern, clean colored
output using the existing color theme and symbols.

Changes in ts/systemd.ts:
- displayServiceStatus(): Parse systemctl output and show key info
  with colored symbols (● for running, ○ for stopped)
- displaySingleUpsStatus(): Clean output with battery/runtime colors
  - Green >60%, yellow 30-60%, red <30% for battery
  - Power status with colored symbols and text
  - Clean indented layout without boxes

Example new output:
  ● Service: active (running)
    PID: 7606  Memory: 41.5M  CPU: 279ms

  UPS Devices (2):
    ● Test UPS (SNMP v1) - Online
      Battery: 100% ✓  Runtime: 48 min
      Host: 192.168.187.140:161

Much cleaner and more readable than ASCII boxes!

deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@serve.zone/nupst",
-  "version": "4.0.5",
+  "version": "4.0.6",
   "exports": "./mod.ts",
   "tasks": {
     "dev": "deno run --allow-all mod.ts",