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/AMDFX-6300Six-Core/catproc.txt

@@ -0,0 +1,26 @@
+processor	: 0
+vendor_id	: AuthenticAMD
+cpu family	: 21
+model		: 2
+model name	: AMD FX(tm)-6300 Six-Core Processor
+stepping	: 0
+microcode	: 0x600081f
+cpu MHz		: 1400.000
+cache size	: 2048 KB
+physical id	: 0
+siblings	: 6
+core id		: 0
+cpu cores	: 3
+apicid		: 16
+initial apicid	: 0
+fpu		: yes
+fpu_exception	: yes
+cpuid level	: 13
+wp		: yes
+flags		: 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 extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb arat cpb hw_pstate npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold bmi1
+bogomips	: 7023.87
+TLB size	: 1536 4K pages
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 48 bits physical, 48 bits virtual
+power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro

benchmark-data/data/hardware/AMDFX-6300Six-Core/lscpu.txt

@@ -0,0 +1,21 @@
+Arquitectura:          x86_64
+CPU op-mode(s):        32-bit, 64-bit
+Orden de bytes:        Little Endian
+CPU(s):                6
+On-line CPU(s) list:   0-5
+Hilo(s) por núcleo:   2
+Núcleo(s) por zócalo:3
+Socket(s):             1
+Nodo(s) NUMA:          1
+ID del vendedor:       AuthenticAMD
+Familia de CPU:        21
+Modelo:                2
+Stepping:              0
+CPU MHz:               1400.000
+BogoMIPS:              7023.87
+Virtualización:       AMD-V
+caché L1d:            16K
+caché L1i:            64K
+caché L2:             2048K
+caché L3:             8192K
+NUMA node0 CPU(s):     0-5