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/suite/pts-cstrike.csv

@@ -0,0 +1,12 @@
+,idproc,descproc,percentile,nbproc,perf
+0,/s/XFX+AMD+Radeon+R9+290,XFX AMD Radeon R9 290,96th,3,236 +/- 10
+1,/s/ASUS+AMD+Radeon+HD+7800,ASUS AMD Radeon HD 7800,92nd,3,218 +/- 27
+2,/s/Sapphire+AMD+Radeon+HD+6870,Sapphire AMD Radeon HD 6870,92nd,5,217 +/- 15
+3,/s/Sapphire+AMD+Radeon+HD+6800,Sapphire AMD Radeon HD 6800,90th,3,208 +/- 9
+4,/s/XFX+AMD+Radeon+HD+7900,XFX AMD Radeon HD 7900,90th,5,207 +/- 28
+5,/s/Sapphire+AMD+Radeon+HD+5830,Sapphire AMD Radeon HD 5830,81st,4,164 +/- 23
+7,/s/Sapphire+AMD+Radeon+HD+6770,Sapphire AMD Radeon HD 6770,74th,4,140 +/- 15
+9,/s/AMD+Radeon+HD+6670,AMD Radeon HD 6670,46th,171,107 +/- 1
+11,/s/Sapphire+AMD+Radeon+HD+4770,Sapphire AMD Radeon HD 4770,20th,3,81 +/- 1
+12,/s/ASUS+AMD+Radeon+HD+8400,ASUS AMD Radeon HD 8400,11th,3,40
+13,/s/AMD+Radeon+HD+8400,AMD Radeon HD 8400,11th,8,39 +/- 2