feat: automation with controlfs:// protocol links and command-line flags

[lippdev]

Adds automation support for launching, focusing, and cleanly closing ControlFS via custom URI protocol links (\controlfs://start, \controlfs://stop, \controlfs://show) and command-line arguments (--start, --stop, --show, --close). This enables seamless integration between external tools such as Console Mode, Stream Deck buttons, and user automation scripts:

• Protocol & CLI Parsing (\ControlFS.Core.Automation.AppProtocol):
  • Pure parsing logic for \controlfs://start\ (alias \open), \controlfs://stop\ (aliases \close, \quit), and \controlfs://show.
  • Handles CLI flags: --start, --open, --stop, --close, --quit, --show.
  • Tolerant to trailing slashes, query parameters, fragments, and case variations.
• Single-Instance Coordination (\ControlFS.Infrastructure.Windows.Automation):
  • Enforces a single instance per Windows user session via named mutex \Local\ControlFS.Instance.
  • Passing --render-screens\ bypasses single-instance checks so smoke runs are completely unaffected.
  • If already running: \controlfs://start, \controlfs://show\ or running \ControlFS.exe\ signals the active instance to restore from minimized and bring itself to foreground (\Local\ControlFS.Show\ + Win32 \BringToForeground), exiting the new process immediately without starting WinUI.
  • Invoking \controlfs://stop\ or \ControlFS.exe --stop\ cleanly signals \Local\ControlFS.Close, canceling any active operations and saving settings via \AppController.RequestAutomationExit(). If nothing is running, exits cleanly.
• Protocol Registration (\ControlFS.Infrastructure.Windows.Shell.ProtocolRegistration\ & \�uild/ControlFS.iss):
  • Registers \HKCU\Software\Classes\controlfs\ with \URL Protocol\ and \shell\open\command\ in Inno Setup.
  • Dynamic runtime registration ensures portable builds and path moves update the registry automatically.
• Tests:
  • 47 new unit tests in \AppProtocolTests\ covering URI formats, CLI flags, query strings, case tolerance, and invalid URLs.
  • Windows integration tests in \ProtocolRegistrationIntegrationTests\ and \SingleInstanceIntegrationTests\ verifying registry writing and inter-process event signaling (\Show/\Close).
• Docs & Changelogs:
  • Updated \README.md\ and \README.pt-BR.md.
  • Added Automation section to \docs/GUIDE.md\ and \docs/GUIDE.pt-BR.md.
  • Added checklist items in \docs/TESTING.md.
  • Updated \CHANGELOG.md\ and \CHANGELOG.en-US.md\ under ## [Unreleased].