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/AMDRyzen5PRO4650G/lscpu.txt

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+Architektura:                    x86_64
+Tryb(y) pracy CPU:               32-bit, 64-bit
+Kolejność bajtów:                Little Endian
+Address sizes:                   48 bits physical, 48 bits virtual
+CPU:                             12
+Lista aktywnych CPU:             0-11
+Wątków na rdzeń:                 2
+Rdzeni na gniazdo:               6
+Gniazd:                          1
+Węzłów NUMA:                     1
+ID producenta:                   AuthenticAMD
+Rodzina CPU:                     23
+Model:                           96
+Nazwa modelu:                    AMD Ryzen 5 PRO 4650G with Radeon Graphics
+Wersja:                          1
+Frequency boost:                 enabled
+CPU MHz:                         1400.000
+CPU max MHz:                     4307,0308
+CPU min MHz:                     1400,0000
+BogoMIPS:                        7385.96
+Wirtualizacja:                   AMD-V
+Cache L1d:                       192 KiB
+Cache L1i:                       192 KiB
+Cache L2:                        3 MiB
+Cache L3:                        8 MiB
+Procesory węzła NUMA 0:          0-11
+Vulnerability Itlb multihit:     Not affected
+Vulnerability L1tf:              Not affected
+Vulnerability Mds:               Not affected
+Vulnerability Meltdown:          Not affected
+Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
+Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and __user pointer sanitization
+Vulnerability Spectre v2:        Mitigation; Full AMD retpoline, IBPB conditional, IBRS_FW, STIBP conditional, RSB filling
+Vulnerability Srbds:             Not affected
+Vulnerability Tsx async abort:   Not affected
+Flagi:                           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 constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif umip rdpid overflow_recov succor smca