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/AMDRyzenThreadripper2920X12-Core/catproc.txt

@@ -0,0 +1,27 @@
+processor	: 0
+vendor_id	: AuthenticAMD
+cpu family	: 23
+model		: 8
+model name	: AMD Ryzen Threadripper 2920X 12-Core Processor
+stepping	: 2
+microcode	: 0x800820b
+cpu MHz		: 1978.579
+cache size	: 512 KB
+physical id	: 0
+siblings	: 24
+core id		: 0
+cpu cores	: 12
+apicid		: 0
+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 cpuid extd_apicid amd_dcm 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 skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate sme ssbd sev ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smca
+bugs		: sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass
+bogomips	: 6986.09
+TLB size	: 2560 4K pages
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 43 bits physical, 48 bits virtual
+power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14]

benchmark-data/data/hardware/AMDRyzenThreadripper2920X12-Core/lscpu.txt

@@ -0,0 +1,25 @@
+Architecture:        x86_64
+CPU op-mode(s):      32-bit, 64-bit
+Byte Order:          Little Endian
+CPU(s):              24
+On-line CPU(s) list: 0-23
+Thread(s) per core:  2
+Core(s) per socket:  12
+Socket(s):           1
+NUMA node(s):        1
+Vendor ID:           AuthenticAMD
+CPU family:          23
+Model:               8
+Model name:          AMD Ryzen Threadripper 2920X 12-Core Processor
+Stepping:            2
+CPU MHz:             2239.598
+CPU max MHz:         3500,0000
+CPU min MHz:         2200,0000
+BogoMIPS:            6986.09
+Virtualization:      AMD-V
+L1d cache:           32K
+L1i cache:           64K
+L2 cache:            512K
+L3 cache:            8192K
+NUMA node0 CPU(s):   0-23
+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 cpuid extd_apicid amd_dcm 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 skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate sme ssbd sev ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smca