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/IntelCorei7640L/catproc.txt

@@ -0,0 +1,26 @@
+processor	: 0
+vendor_id	: GenuineIntel
+cpu family	: 6
+model		: 37
+model name	: Intel(R) Core(TM) i7 CPU       L 640  @ 2.13GHz
+stepping	: 5
+microcode	: 0x7
+cpu MHz		: 1324.297
+cache size	: 4096 KB
+physical id	: 0
+siblings	: 4
+core id		: 0
+cpu cores	: 2
+apicid		: 0
+initial apicid	: 0
+fpu		: yes
+fpu_exception	: yes
+cpuid level	: 11
+wp		: yes
+flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt aes lahf_lm pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid dtherm ida arat flush_l1d
+bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit
+bogomips	: 4256.11
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 36 bits physical, 48 bits virtual
+power management:

benchmark-data/data/hardware/IntelCorei7640L/lscpu.txt

@@ -0,0 +1,25 @@
+Arquitectura:                        x86_64
+modo(s) de operación de las CPUs:    32-bit, 64-bit
+Orden de los bytes:                  Little Endian
+CPU(s):                              4
+Lista de la(s) CPU(s) en línea:      0-3
+Hilo(s) de procesamiento por núcleo: 2
+Núcleo(s) por «socket»:              2
+«Socket(s)»                          1
+Modo(s) NUMA:                        1
+ID de fabricante:                    GenuineIntel
+Familia de CPU:                      6
+Modelo:                              37
+Nombre del modelo:                   Intel(R) Core(TM) i7 CPU       L 640  @ 2.13GHz
+Revisión:                            5
+CPU MHz:                             1478.074
+CPU MHz máx.:                        2134.0000
+CPU MHz mín.:                        1199.0000
+BogoMIPS:                            4256.11
+Virtualización:                      VT-x
+Caché L1d:                           32K
+Caché L1i:                           32K
+Caché L2:                            256K
+Caché L3:                            4096K
+CPU(s) del nodo NUMA 0:              0-3
+Indicadores:                         fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt aes lahf_lm pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid dtherm ida arat flush_l1d