Fix UPS notifications and add periodic battery status emails

- Fix permission denied on log files (chown nut:nut)
- Fix upssched.conf permissions (root:nut)
- Add sudo for perl to allow PVE::Notify from user nut
- Add periodic battery status emails every minute when on battery
- Add charging status emails at 5, 10, 30 min after power restore
- Remove diacritics from all notification messages
- Update documentation with sudo and permissions setup

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

proxmox/ups/docs/INSTALARE-NUT.md

@@ -241,14 +241,39 @@ EOF
 
 ### 5.2. Creare handler script
 
-Copiază scriptul `upssched-cmd` din directorul `scripts/` în `/usr/local/bin/`:
+Copiaza scriptul `upssched-cmd` din directorul `scripts/` in `/usr/local/bin/`:
 
 ```bash
 cp scripts/upssched-cmd /usr/local/bin/
 chmod +x /usr/local/bin/upssched-cmd
 ```
 
-### 5.3. Creare director runtime
+### 5.3. Configurare sudo pentru user nut
+
+Scripturile ruleaza ca user `nut` si au nevoie de sudo pentru a accesa PVE::Notify:
+
+```bash
+# Instaleaza sudo daca nu exista
+apt-get install -y sudo
+
+# Configureaza permisiuni sudo pentru user nut
+cat > /etc/sudoers.d/nut << 'EOF'
+nut ALL=(root) NOPASSWD: /usr/bin/perl
+EOF
+chmod 440 /etc/sudoers.d/nut
+```
+
+### 5.4. Configurare permisiuni fisiere log
+
+Fisierele de log trebuie sa fie writable de user-ul `nut`:
+
+```bash
+touch /var/log/ups-events.log /var/log/ups-shutdown.log
+chown nut:nut /var/log/ups-events.log /var/log/ups-shutdown.log
+chmod 664 /var/log/ups-events.log /var/log/ups-shutdown.log
+```
+
+### 5.5. Creare director runtime
 
 ```bash
 mkdir -p /run/nut