fix: Rebrand project from PiPedal to OP-Pedal

Updated branding across the project:
- CMakeLists.txt: project name, description, homepage, display version
- src/PiPedalVersion.cpp: server name string
- debian/control: package name, source, homepage, description
- vite/package.json: package name
- vite/index.html: title, meta description
- vite/public/manifest.json: name, short_name, description, URLs
- UI files: AboutDialog, AppThemed, MainPage, SettingsDialog,
  UpdateDialog, WifiConfigDialog, WifiConfigSettings,
  WifiDirectConfigSettings, Tone3000Downloader, Tone3000HelpDialog,
  WindowScale

Preserved upstream copyright/attribution and legal references.

debian/control

@@ -1,10 +1,10 @@
 Depends: dnsmasq(>= 2.85),lv2-dev(>=1.14), iw
 Description: IoT guitar effect for Raspberry Pi
  IoT guitar effect pedal for Raspberry Pi, with phone-friendly web interface.
-Homepage: https://github.com/rerdavies/pipedal
+Homepage: https://ourpad.casa/op-pedal
 Maintainer: Robin E. R. Davies<rerdavies@gmail.com>
-Source: pipedal
-Package: pipedal
+Source: oppedal
+Package: oppedal
 Priority: optional
 Section: sound
 Version: 1.2.32