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/IntelPentiumG3258/catproc.txt

@@ -0,0 +1,26 @@
+processor	: 0
+vendor_id	: GenuineIntel
+cpu family	: 6
+model		: 60
+model name	: Intel(R) Pentium(R) CPU G3258 @ 3.20GHz
+stepping	: 3
+microcode	: 0x28
+cpu MHz		: 3591.294
+cache size	: 3072 KB
+physical id	: 0
+siblings	: 2
+core id		: 0
+cpu cores	: 2
+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 dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer xsave rdrand lahf_lm abm cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust erms invpcid xsaveopt dtherm ida arat pln pts md_clear flush_l1d
+bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit srbds
+bogomips	: 6411.06
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 39 bits physical, 48 bits virtual
+power management:

benchmark-data/data/hardware/IntelPentiumG3258/lscpu.txt

@@ -0,0 +1,35 @@
+Architecture:                    x86_64
+CPU op-mode(s):                  32-bit, 64-bit
+Byte Order:                      Little Endian
+Address sizes:                   39 bits physical, 48 bits virtual
+CPU(s):                          2
+On-line CPU(s) list:             0,1
+Thread(s) per core:              1
+Core(s) per socket:              2
+Socket(s):                       1
+NUMA node(s):                    1
+Vendor ID:                       GenuineIntel
+CPU family:                      6
+Model:                           60
+Model name:                      Intel(R) Pentium(R) CPU G3258 @ 3.20GHz
+Stepping:                        3
+CPU MHz:                         3799.150
+CPU max MHz:                     4000.0000
+CPU min MHz:                     800.0000
+BogoMIPS:                        6411.06
+Virtualization:                  VT-x
+L1d cache:                       64 KiB
+L1i cache:                       64 KiB
+L2 cache:                        512 KiB
+L3 cache:                        3 MiB
+NUMA node0 CPU(s):               0,1
+Vulnerability Itlb multihit:     KVM: Vulnerable
+Vulnerability L1tf:              Mitigation; PTE Inversion
+Vulnerability Mds:               Mitigation; Clear CPU buffers; SMT disabled
+Vulnerability Meltdown:          Mitigation; PTI
+Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
+Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and __user pointer sanitization
+Vulnerability Spectre v2:        Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP disabled, RSB filling
+Vulnerability Srbds:             Mitigation; Microcode
+Vulnerability Tsx async abort:   Not affected
+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 pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer xsave rdrand lahf_lm abm cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust erms invpcid xsaveopt dtherm ida arat pln pts md_clear flush_l1d