feat installer and download model on first launch

packaging/installer.iss

@@ -0,0 +1,55 @@
+; Inno Setup script for Dev Assist Chatbot.
+;
+; Build the app first (packaging/build.spec), then compile this with the
+; Inno Setup Compiler (ISCC.exe) or the IDE, from the repo root:
+;
+;   iscc packaging\installer.iss
+;
+; Output lands in packaging\Output\DevAssistChatbot-Setup.exe.
+
+#define MyAppName "Dev Assist Chatbot"
+#define MyAppVersion "0.1.0"
+#define MyAppExeName "DevAssistChatbot.exe"
+
+[Setup]
+AppId={{A9F1D6C2-4B3E-4A7F-9C1D-3E5B7A2F8D41}
+AppName={#MyAppName}
+AppVersion={#MyAppVersion}
+DefaultDirName={autopf}\{#MyAppName}
+DefaultGroupName={#MyAppName}
+DisableProgramGroupPage=yes
+OutputDir=Output
+OutputBaseFilename=DevAssistChatbot-Setup
+Compression=lzma2
+SolidCompression=yes
+ArchitecturesAllowed=x64compatible
+ArchitecturesInstallIn64BitMode=x64compatible
+WizardStyle=modern
+
+[Tasks]
+Name: "desktopicon"; Description: "Create a &desktop icon"; GroupDescription: "Additional icons:"
+
+[Files]
+Source: "..\dist\DevAssistChatbot\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+; Optional: bundle the VC++ redistributable for machines that don't already
+; have it (most Windows 11 installs do, via Windows Update or another app).
+; Download it from https://aka.ms/vs/17/release/vc_redist.x64.exe, place it
+; at packaging\redist\vc_redist.x64.exe, then uncomment these two lines and
+; the matching [Run] entry below.
+; Source: "redist\vc_redist.x64.exe"; DestDir: "{tmp}"; Flags: deleteafterinstall
+
+[Icons]
+Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"
+Name: "{autodesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; Tasks: desktopicon
+
+[Run]
+; Filename: "{tmp}\vc_redist.x64.exe"; Parameters: "/install /quiet /norestart"; StatusMsg: "Installing Visual C++ runtime..."; Check: not VCRedistInstalled
+Filename: "{app}\{#MyAppExeName}"; Description: "Launch {#MyAppName}"; Flags: nowait postinstall skipifsilent
+
+[Code]
+function VCRedistInstalled: Boolean;
+begin
+  // Present once the VC++ 2015-2022 x64 runtime is installed (also true on
+  // most Windows 11 machines already, via Windows Update or another app).
+  Result := RegKeyExists(HKLM64, 'SOFTWARE\Microsoft\VisualStudio\14.0\VC\Runtimes\X64');
+end;