Add WiFi and HDMI power saving features for remote sensors

Implements power saving optimizations to extend battery life on solar-powered remote air quality sensors:

- WiFi Power Saving: Disable WiFi 10 minutes after boot to save ~100-200mA
  - Configurable via web UI checkbox in admin panel
  - WiFi automatically re-enables after reboot for 10-minute configuration window
  - Systemd timer (nebuleair-wifi-powersave.timer) manages automatic disable
  - New wifi/power_save.py script checks database config and disables WiFi via nmcli

- HDMI Disable: Added hdmi_blanking=2 to boot config to save ~20-30mA
  - Automatically configured during installation

- Database: Added wifi_power_saving boolean config (default: disabled)
  - Uses INSERT OR IGNORE for safe updates to existing installations

- UI: Added checkbox control in admin.html for WiFi power saving
  - Includes helpful description of power savings and behavior

- Services: Updated setup_services.sh and update_firmware.sh to manage new timer

Total power savings: ~120-230mA when WiFi power saving enabled

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

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

installation_part1.sh

@@ -81,9 +81,9 @@ fi
 info "Set config..."
 if [[ -f "$REPO_DIR/sqlite/set_config.py" ]]; then
     sudo /usr/bin/python3 "$REPO_DIR/sqlite/set_config.py" || error "Failed to set config."
-    success "Databases created successfully."
+    success "Databases set configuration successfully."
 else
-    warning "Database creation script not found."
+    warning "Database set configuration script not found."
 fi
 
 # Configure Apache
@@ -141,11 +141,11 @@ if ! sudo visudo -c; then
     error "Sudoers file has syntax errors! Please fix manually with 'sudo visudo'"
 fi
 
-# Open all UART serial ports (avoid duplication)
-info "Configuring UART serial ports..."
+# Open all UART serial ports and disable HDMI (avoid duplication)
+info "Configuring UART serial ports and disabling HDMI to save power..."
 if ! grep -q "enable_uart=1" /boot/firmware/config.txt; then
-    echo -e "\nenable_uart=1\ndtoverlay=uart0\ndtoverlay=uart1\ndtoverlay=uart2\ndtoverlay=uart3\ndtoverlay=uart4\ndtoverlay=uart5" | sudo tee -a /boot/firmware/config.txt > /dev/null
-    success "UART configuration added."
+    echo -e "\nenable_uart=1\ndtoverlay=uart0\ndtoverlay=uart1\ndtoverlay=uart2\ndtoverlay=uart3\ndtoverlay=uart4\ndtoverlay=uart5\n\n# Disable HDMI to save power (~20-30mA)\nhdmi_blanking=2" | sudo tee -a /boot/firmware/config.txt > /dev/null
+    success "UART configuration and HDMI disable added."
 else
     warning "UART configuration already set. Skipping."
 fi
@@ -159,10 +159,6 @@ info "Enabling I2C ports..."
 sudo raspi-config nonint do_i2c 0
 success "I2C ports enabled."
 
-#creates databases
-info "Creates sqlites databases..."
-/usr/bin/python3 /var/www/nebuleair_pro_4g/sqlite/create_db.py
-
 # Final sudoers check
 if sudo visudo -c; then
     success "Sudoers file is valid."