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/AMDA10-6700APU/catproc.txt

@@ -0,0 +1,27 @@
+processor	: 0
+vendor_id	: AuthenticAMD
+cpu family	: 21
+model		: 19
+model name	: AMD A10-6700 APU with Radeon(tm) HD Graphics
+stepping	: 1
+microcode	: 0x6001119
+cpu MHz		: 1800.000
+cache size	: 2048 KB
+physical id	: 0
+siblings	: 4
+core id		: 0
+cpu cores	: 2
+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 eagerfpu 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 cpb hw_pstate vmmcall bmi1 arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
+bugs		: fxsave_leak sysret_ss_attrs null_seg
+bogomips	: 7386.38
+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/AMDA10-6700APU/lscpu.txt

@@ -0,0 +1,24 @@
+Architecture:          x86_64
+CPU op-mode(s):        32-bit, 64-bit
+Byte Order:            Little Endian
+CPU(s):                4
+On-line CPU(s) list:   0-3
+Thread(s) per core:    2
+Core(s) per socket:    2
+Socket(s):             1
+NUMA node(s):          1
+Vendor ID:             AuthenticAMD
+CPU family:            21
+Model:                 19
+Model name:            AMD A10-6700 APU with Radeon(tm) HD Graphics
+Stepping:              1
+CPU MHz:               1800.000
+CPU max MHz:           3700,0000
+CPU min MHz:           1800,0000
+BogoMIPS:              7386.38
+Virtualization:        AMD-V
+L1d cache:             16K
+L1i cache:             64K
+L2 cache:              2048K
+NUMA node0 CPU(s):     0-3
+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 eagerfpu 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 cpb hw_pstate vmmcall bmi1 arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold