Initial commit: 펌웨어 플래시 도구 (WPF) + 기존 PowerShell 키트

- DB720Flasher: WPF .NET 9 GUI 플래셔
  - 멀티모델 프로파일(flash.json + 빌트인 DB720/DB402S/DB400S/DB400Q/DB300eM)
  - 포트 자동감지(JTAG 우선, 유령 포트 자동 회피), esptool v5 동봉
- flash_app.ps1 / flash_full.ps1 / list_ports.ps1: 기존 PowerShell 키트
- profiles/: 모델별 flash.json 템플릿
- firmware/flash.json: DB720 모델 설정 (서명 실펌웨어 .bin 은 repo 제외)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

DB720Flasher/app.manifest

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="DB720Flasher.app" />
+
+  <!-- DPI 인식: 고해상도에서 또렷하게 -->
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
+    </windowsSettings>
+  </application>
+
+  <!-- Windows 10/11 호환 선언 -->
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>