Complete Captail internal rebrand

[FaulMit]

What changed

• Rename InstantReplay.sln, project directory, project file, and C# namespaces to Captail.
• Rename the application icon and native log bridge to Captail.ico and CaptailObsBridge.dll.
• Update CMake, MSBuild, installer, release scripts, CI, and contributor commands for the new paths.
• Remove obsolete pre-public legacy identifiers from config, autostart, single-instance IPC, and the capture fixture.
• Standardize repository comments and diagnostic messages in English.
• Add a real English-interface screenshot to the README.
• Add a concise comparison with OBS Replay Buffer.

Why

Public branding was already Captail, while internal names still exposed earlier project names. This makes the repository, build output, and native components consistent with the public product.

Validation

• dotnet build .\Captail.sln -c Release -p:ContinuousIntegrationBuild=true
• 0 warnings, 0 errors
• Portable package built successfully: 89 files
• CaptailObsBridge.dll present in build and Portable package
• No InstantReplay or Everloop identifiers remain in tracked source
• EN/RU localization dictionaries match: 195 keys each
• GitHub YAML parses successfully
• Real Captail Windows UI launched and captured in English

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