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/AMDA6-3410MXAPU/lscpu.txt

@@ -0,0 +1,24 @@
+Architektur:                   x86_64
+CPU Operationsmodus:           32-bit, 64-bit
+Byte-Reihenfolge:              Little Endian
+CPU(s):                        4
+Liste der Online-CPU(s):       0-3
+Thread(s) pro Kern:            1
+Kern(e) pro Socket:            4
+Sockel:                        1
+NUMA-Knoten:                   1
+Anbieterkennung:               AuthenticAMD
+Prozessorfamilie:              18
+Modell:                        1
+Modellname:                    AMD A6-3410MX APU with Radeon(tm) HD Graphics
+Stepping:                      0
+CPU MHz:                       1597.082
+Maximale Taktfrequenz der CPU: 1600,0000
+Minimale Taktfrequenz der CPU: 800,0000
+BogoMIPS:                      3194.16
+Virtualisierung:               AMD-V
+L1d Cache:                     64K
+L1i Cache:                     64K
+L2 Cache:                      1024K
+NUMA-Knoten0 CPU(s):           0-3
+Markierungen:                  fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save pausefilter