chore: Windows build, Inno Setup installer, MSIX support, README güncellemesi

- flutter build windows --release başarılı
- Inno Setup installer (dist/imajviewer_setup_1.0.0.exe)
- MSIX paketi mevcut (imzasız, Developer Mode gerekli)
- pubspec.yaml: msix_config eklendi
- .gitignore: dist/, *.pfx, *.cer, *.msix
- README.md: Windows kurulum seçenekleri güncellendi

windows/installer.iss

@@ -0,0 +1,63 @@
+; ImajViewer Setup Script
+; Inno Setup 6
+
+#define MyAppName "ImajViewer"
+#define MyAppVersion "1.0.0"
+#define MyAppPublisher "imajviewer"
+#define MyAppURL "https://git.softmediadesign.com/git_alhan/imajviewer"
+#define MyAppExeName "imajviewer.exe"
+
+[Setup]
+AppId={{B8F4A3D2-1C5E-4A7B-9D0F-6E2C8A1B3D5F}
+AppName={#MyAppName}
+AppVersion={#MyAppVersion}
+AppPublisher={#MyAppPublisher}
+AppPublisherURL={#MyAppURL}
+DefaultDirName={autopf}\{#MyAppName}
+DefaultGroupName={#MyAppName}
+DisableProgramGroupPage=yes
+OutputDir=..\dist
+OutputBaseFilename=imajviewer_setup_{#MyAppVersion}
+Compression=lzma
+SolidCompression=yes
+WizardStyle=modern
+PrivilegesRequired=admin
+ArchitecturesInstallIn64BitMode=x64compatible
+
+[Languages]
+Name: "turkish"; MessagesFile: "compiler:Languages\Turkish.isl"
+Name: "english"; MessagesFile: "compiler:Default.isl"
+
+[Tasks]
+Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: checkedonce
+
+[Files]
+Source: "..\build\windows\x64\runner\Release\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+
+[Icons]
+Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"
+Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"
+Name: "{autodesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
+
+[Run]
+Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#MyAppName}}"; Flags: nowait postinstall skipifsilent
+
+[Registry]
+; Register as default image viewer
+Root: HKCR; Subkey: ".png\OpenWithProgids\ImajViewer"; ValueType: string; ValueData: ""; Flags: uninsdeletevalue
+Root: HKCR; Subkey: ".jpg\OpenWithProgids\ImajViewer"; ValueType: string; ValueData: ""; Flags: uninsdeletevalue
+Root: HKCR; Subkey: ".jpeg\OpenWithProgids\ImajViewer"; ValueType: string; ValueData: ""; Flags: uninsdeletevalue
+Root: HKCR; Subkey: ".webp\OpenWithProgids\ImajViewer"; ValueType: string; ValueData: ""; Flags: uninsdeletevalue
+Root: HKCR; Subkey: ".bmp\OpenWithProgids\ImajViewer"; ValueType: string; ValueData: ""; Flags: uninsdeletevalue
+Root: HKCR; Subkey: ".gif\OpenWithProgids\ImajViewer"; ValueType: string; ValueData: ""; Flags: uninsdeletevalue
+
+[Code]
+procedure CurStepChanged(CurStep: TSetupStep);
+begin
+  if CurStep = ssPostInstall then
+  begin
+    // Register application path for OpenWith
+    RegWriteStringValue(HKEY_CLASSES_ROOT, 'Applications\imajviewer.exe\shell\open\command', '', ExpandConstant('"{app}\imajviewer.exe" "%1"'));
+    RegWriteStringValue(HKEY_CURRENT_USER, 'Software\RegisteredApplications', 'ImajViewer', ExpandConstant('Software\ImajViewer\Capabilities'));
+  end;
+end;