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.

CMakeLists.txt

@@ -1,11 +1,11 @@
 cmake_minimum_required(VERSION 3.16.0)
-project(pipedal 
+project(op-pedal 
     VERSION 2.0.107
-    DESCRIPTION "PiPedal Guitar Effect Pedal For Raspberry Pi"
-    HOMEPAGE_URL "https://rerdavies.github.io/pipedal"
+    DESCRIPTION "OP-Pedal Guitar Effect Pedal For Raspberry Pi"
+    HOMEPAGE_URL "https://ourpad.casa/op-pedal"
 )
 
-set (DISPLAY_VERSION "PiPedal v2.0.107-Release")
+set (DISPLAY_VERSION "OP-Pedal / Ourpad Pedal v2.0.107-Release")
 
 option(PIPEDAL_DISABLE_COPYRIGHT_BUILD "Skip generation of copyright notices (use on non-Debian distros)" OFF)
 option(PIPEDAL_EXCLUDE_TESTS "Exclude test targets from default build" OFF)