feat: .deb paketi + kurulum talimatı

deb/DEBIAN/control

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+Package: imajviewer
+Version: 1.0.0
+Section: graphics
+Priority: optional
+Architecture: amd64
+Depends: libgtk-3-0, libx11-6, xdg-utils
+Maintainer: Alhan <alhan@softmediadesign.com>
+Description: Ultra hafif Linux görüntü izleyici
+ Flutter ile yazılmış, PNG/JPG/WebP/BMP/GIF
+ destekleyen hızlı ve hafif bir resim görüntüleyici.

deb/DEBIAN/postinst

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+#!/bin/sh
+set -e
+
+# Varsayılan görüntü izleyici olarak ayarla
+for mime in image/png image/jpeg image/jpg image/webp image/bmp image/gif; do
+  xdg-mime default imajviewer.desktop "$mime" 2>/dev/null || true
+done
+
+# Masaüstü veritabanını güncelle
+which update-desktop-database >/dev/null 2>&1 && \
+  update-desktop-database /usr/share/applications/ 2>/dev/null || true
+which gtk-update-icon-cache >/dev/null 2>&1 && \
+  gtk-update-icon-cache /usr/share/icons/hicolor/ 2>/dev/null || true
+
+exit 0

deb/DEBIAN/prerm

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+#!/bin/sh
+set -e
+
+# Varsayılan görüntü izleyici atamasını kaldır
+for mime in image/png image/jpeg image/jpg image/webp image/bmp image/gif; do
+  current=$(xdg-mime query default "$mime" 2>/dev/null || true)
+  if [ "$current" = "imajviewer.desktop" ]; then
+    xdg-mime default "" "$mime" 2>/dev/null || true
+  fi
+done
+
+exit 0

deb/usr/bin/imajviewer

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+/usr/lib/imajviewer/imajviewer

deb/usr/lib/imajviewer/data/flutter_assets/FontManifest.json

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+[{"family":"MaterialIcons","fonts":[{"asset":"fonts/MaterialIcons-Regular.otf"}]}]

deb/usr/lib/imajviewer/data/flutter_assets/NativeAssetsManifest.json

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+{"format-version":[1,0,0],"native-assets":{}}

deb/usr/lib/imajviewer/data/flutter_assets/version.json

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+{"app_name":"imajviewer","version":"1.0.0","build_number":"1","package_name":"imajviewer"}

deb/usr/lib/imajviewer/lib/native_assets.json

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+{"format-version":[1,0,0],"native-assets":{}}

deb/usr/share/applications/imajviewer.desktop

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+[Desktop Entry]
+Type=Application
+Name=imajViewer
+Comment=Ultra hafif görüntü izleyici
+Exec=/usr/bin/imajviewer %F
+Icon=imajviewer
+Terminal=false
+Categories=Graphics;Viewer;RasterGraphics;
+MimeType=image/png;image/jpeg;image/webp;image/bmp;image/gif;image/jpg;
+StartupNotify=false

deb/usr/share/mime/packages/imajviewer.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
+  <mime-type type="image/png">
+    <comment>PNG image</comment>
+    <glob pattern="*.png"/>
+  </mime-type>
+  <mime-type type="image/jpeg">
+    <comment>JPEG image</comment>
+    <glob pattern="*.jpg"/>
+    <glob pattern="*.jpeg"/>
+  </mime-type>
+  <mime-type type="image/webp">
+    <comment>WebP image</comment>
+    <glob pattern="*.webp"/>
+  </mime-type>
+  <mime-type type="image/bmp">
+    <comment>BMP image</comment>
+    <glob pattern="*.bmp"/>
+  </mime-type>
+  <mime-type type="image/gif">
+    <comment>GIF image</comment>
+    <glob pattern="*.gif"/>
+  </mime-type>
+</mime-info>