feat: 대역폭 추정 및 DAU 표시 기능 추가

- 동시접속자 기반 월간 대역폭 자동 추정
- DAU(일일활성사용자) 추정치 표시 (동접 × 10-14)
- 대역폭 기반 Linode/Vultr 자동 선택 로직
- 비용 분석에 대역폭 비용 포함
- 지역 미선택시 서울/도쿄/오사카/싱가포르 기본 표시
- 지역별 서버 분리 표시 (GROUP BY instance + region)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

benchmark-data/data/hardware/GigabyteAMDRadeonR7370/lscpu.txt

@@ -0,0 +1,17 @@
+===========
+VULKAN INFO
+===========
+
+Vulkan API Version: 1.0.21
+
+INFO: [loader] Code 0 : Found manifest file /home/phoronix/.local/share/vulkan/implicit_layer.d/steamoverlay_i386.json, version "1.0.0"
+INFO: [loader] Code 0 : Found manifest file /home/phoronix/.local/share/vulkan/implicit_layer.d/steamoverlay_x86_64.json, version "1.0.0"
+INFO: [loader] Code 0 : Found manifest file /usr/share/vulkan/icd.d/intel_icd.json, version "1.0.0"
+
+Instance Extensions:
+====================
+Instance Extensions	count = 3
+	VK_KHR_surface                      : extension revision 25
+	VK_KHR_xcb_surface                  : extension revision  5
+	VK_EXT_debug_report                 : extension revision  3
+/build/vulkan-ijAUlz/vulkan-1.0.21.0+dfsg1/demos/vulkaninfo.c:1415: failed with VK_ERROR_INITIALIZATION_FAILED