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/8xAMDOpteron63xxclass/catproc.txt

@@ -0,0 +1,26 @@
+processor	: 0
+vendor_id	: AuthenticAMD
+cpu family	: 21
+model		: 2
+model name	: AMD Opteron 63xx class CPU
+stepping	: 0
+microcode	: 0x1000065
+cpu MHz		: 3515.784
+cache size	: 512 KB
+physical id	: 0
+siblings	: 1
+core id		: 0
+cpu cores	: 1
+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 syscall nx mmxext fxsr_opt pdpe1gb lm rep_good nopl extd_apicid pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c hypervisor lahf_lm cmp_legacy svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw xop fma4 tbm arat vmmcall bmi1
+bogomips	: 7031.56
+TLB size	: 1024 4K pages
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 40 bits physical, 48 bits virtual
+power management:

benchmark-data/data/hardware/8xAMDOpteron63xxclass/lscpu.txt

@@ -0,0 +1,22 @@
+Architecture:          x86_64
+CPU op-mode(s):        32-bit, 64-bit
+Byte Order:            Little Endian
+CPU(s):                8
+On-line CPU(s) list:   0-7
+Thread(s) per core:    1
+Core(s) per socket:    1
+Socket(s):             8
+NUMA node(s):          1
+Vendor ID:             AuthenticAMD
+CPU family:            21
+Model:                 2
+Stepping:              0
+CPU MHz:               3515.784
+BogoMIPS:              7031.56
+Virtualization:        AMD-V
+Hypervisor vendor:     KVM
+Virtualization type:   full
+L1d cache:             64K
+L1i cache:             64K
+L2 cache:              512K
+NUMA node0 CPU(s):     0-7