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/IntelXeonE-2278GEL/lscpu.txt

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+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):                          16
+On-line CPU(s) list:             0-15
+Thread(s) per core:              2
+Core(s) per socket:              8
+Socket(s):                       1
+NUMA node(s):                    1
+Vendor ID:                       GenuineIntel
+CPU family:                      6
+Model:                           158
+Model name:                      Intel(R) Xeon(R) E-2278GEL CPU @ 2.00GHz
+Stepping:                        13
+CPU MHz:                         1863.199
+CPU max MHz:                     3900.0000
+CPU min MHz:                     800.0000
+BogoMIPS:                        3999.93
+L1d cache:                       256 KiB
+L1i cache:                       256 KiB
+L2 cache:                        2 MiB
+L3 cache:                        16 MiB
+NUMA node0 CPU(s):               0-15
+Vulnerability Itlb multihit:     KVM: Mitigation: VMX unsupported
+Vulnerability L1tf:              Not affected
+Vulnerability Mds:               Not affected
+Vulnerability Meltdown:          Not affected
+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; Enhanced IBRS, IBPB conditional, RSB filling
+Vulnerability Srbds:             Mitigation; TSX disabled
+Vulnerability Tsx async abort:   Mitigation; TSX disabled
+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 art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d arch_capabilities