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/AMDRyzen72700U/lscpu.txt

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+Arkitektur:              x86_64
+Op-tilstande for CPU:    32-bit, 64-bit
+Byterækkefølge:          Little Endian
+CPU'er:                  8
+Tilkoblet cpu(er) liste: 0-7
+Tråde per kerne:         2
+Kerner per sokkel:       4
+Sokler:                  1
+NUMA-knuder:             1
+Leverandør-id:           AuthenticAMD
+CPU-familie:             23
+Model:                   17
+Modelnavn:               AMD Ryzen 7 2700U with Radeon Vega Mobile Gfx
+Modelserie:              0
+CPU MHz:                 1445.265
+CPU maks. MHz:           2200,0000
+CPU min. MHz:            1600,0000
+BogoMIPS:                4391.94
+Virtualisation:          AMD-V
+L1d mellemlager:         32K
+L1i mellemlager:         64K
+L2 mellemlager:          512K
+L3 mellemlager:          4096K
+NUMA-knuder0 CPU'er:     0-7
+Flag:                    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 cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx hw_pstate sme vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smca