feat(release): add flutter build rule, INSTALL.md, and Inno Setup Windows installer script

frontend/INSTALL.md

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+# TIS RMS Installation & Deployment Guide
+
+This guide provides instructions for installing and running the **TIS RMS** frontend client on Android and Windows devices.
+
+---
+
+## 1. Android Installation (APK)
+
+The Android application is distributed as size-optimized APKs supporting both 32-bit and 64-bit architectures.
+
+### Choosing the Right APK:
+
+| APK File | Architecture | Description |
+| :--- | :--- | :--- |
+| **`app-arm64-v8a-release.apk`** | **64-bit ARM** | **Recommended** for modern Android smartphones and tablets (Android 7.0+). Smallest download (~27MB). |
+| **`app-armeabi-v7a-release.apk`** | **32-bit ARM** | For older smartphones or 32-bit budget Android devices (~25MB). |
+| **`app-release.apk`** | **Universal** | Contains all architectures in a single APK (~72MB). Use if unsure of device CPU architecture. |
+
+### Installation Steps:
+1. Transfer the selected `.apk` file to your Android phone/tablet (via USB, local network share, or download).
+2. Tap the `.apk` file in your file manager.
+3. If prompted, enable **"Install unknown apps"** or **"Allow from this source"** in Android Settings.
+4. Tap **Install** and open the app.
+5. On startup, the app will automatically scan the local Wi-Fi/LAN for the TIS RMS server (port `18484`) or connect to the secure tunnel domain (`https://tis-rms.cc.cd/api`).
+
+---
+
+## 2. Windows Desktop Installation
+
+The Windows client runs natively on Windows 10 and Windows 11 (64-bit).
+
+### Prerequisites:
+- **Microsoft Visual C++ 2015–2022 Redistributable (x64)** (usually pre-installed on Windows).
+- **.NET Desktop Runtime 6.0/8.0+** (if leveraging Windows background sync tools).
+
+### Running Portable / Standalone:
+1. Extract the release folder or zip archive (`TIS_RMS_Client_Windows_x64.zip`).
+2. Open the folder and double-click **`tis_rms_server.exe`** (or `tis_rms_frontend.exe`).
+3. (Optional) Right-click `tis_rms_server.exe` -> **Send to** -> **Desktop (create shortcut)**.
+
+### Windows Automated Installer:
+- Run `TIS_RMS_Client_Setup.exe` from the `installers/` folder for an automated desktop shortcut and start menu entry.
+
+---
+
+## 3. Server Discovery & Network Connectivity
+
+When launching TIS RMS on either platform:
+1. **Local LAN Scan**: The app automatically searches your local subnet on port `18484` for ultra-fast local server response.
+2. **Tunnel Domain Fallback**: If you are outside the local network, the app automatically switches to the cloud tunnel domain (`https://tis-rms.cc.cd/api`).
+3. **Manual Server Selection**: You can tap the server icon at the top of the Login Screen anytime to specify a custom server IP or domain.

frontend/TIS_RMS_Client.iss

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+; Script generated for Inno Setup 6
+; TIS RMS Windows Desktop Client Installer
+
+#define MyAppName "TIS RMS Client"
+#define MyAppVersion "1.0.0"
+#define MyAppPublisher "TIS RMS"
+#define MyAppExeName "frontend.exe"
+#define MyAppIcon "windows\runner\resources\app_icon.ico"
+
+[Setup]
+; NOTE: The value of AppId uniquely identifies this application.
+AppId={{D36F3B1A-58F9-4672-91EA-A2B095790FC4}
+AppName={#MyAppName}
+AppVersion={#MyAppVersion}
+AppPublisher={#MyAppPublisher}
+DefaultDirName={autopf}\TIS RMS Client
+DefaultGroupName={#MyAppName}
+AllowNoIcons=yes
+; Output configuration
+OutputDir=..\installers
+OutputBaseFilename=TIS_RMS_Client_Setup
+SetupIconFile={#MyAppIcon}
+UninstallDisplayIcon={app}\{#MyAppExeName}
+; Ultra compression for smallest file size
+Compression=lzma2/ultra64
+SolidCompression=yes
+WizardStyle=modern
+ArchitecturesInstallIn64BitMode=x64compatible
+ArchitecturesAllowed=x64compatible
+DisableDirPage=no
+DisableProgramGroupPage=no
+
+[Languages]
+Name: "english"; MessagesFile: "compiler:Default.isl"
+
+[Tasks]
+Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked
+
+[Files]
+; Main application binaries and libraries (excluding dev .lib and .exp files)
+Source: "build\windows\x64\runner\Release\*.exe"; DestDir: "{app}"; Flags: ignoreversion
+Source: "build\windows\x64\runner\Release\*.dll"; DestDir: "{app}"; Flags: ignoreversion
+Source: "build\windows\x64\runner\Release\data\*"; DestDir: "{app}\data"; Flags: ignoreversion recursesubdirs createallsubdirs
+Source: "{#MyAppIcon}"; DestDir: "{app}"; DestName: "app_icon.ico"; Flags: ignoreversion
+
+[Icons]
+Name: "{group}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; IconFilename: "{app}\app_icon.ico"
+Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"
+Name: "{autodesktop}\{#MyAppName}"; Filename: "{app}\{#MyAppExeName}"; IconFilename: "{app}\app_icon.ico"; Tasks: desktopicon
+
+[Run]
+Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall skipifsilent
+
+[Code]
+// Helper function to check for Microsoft Visual C++ 2015-2022 Redistributable (x64)
+function IsVCRedistInstalled: Boolean;
+var
+  installed: Cardinal;
+begin
+  Result := RegQueryDWordValue(HKLM64, 'SOFTWARE\Microsoft\VisualStudio\14.0\VC\Runtimes\X64', 'Installed', installed) and (installed = 1);
+  if not Result then
+    Result := RegQueryDWordValue(HKLM, 'SOFTWARE\Microsoft\VisualStudio\14.0\VC\Runtimes\X64', 'Installed', installed) and (installed = 1);
+end;
+
+function InitializeSetup: Boolean;
+begin
+  Result := True;
+end;