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/IntelCorei5-3360M/catproc.txt

@@ -0,0 +1,27 @@
+processor	: 0
+vendor_id	: GenuineIntel
+cpu family	: 6
+model		: 58
+model name	: Intel(R) Core(TM) i5-3360M CPU @ 2.80GHz
+stepping	: 9
+microcode	: 0x21
+cpu MHz		: 2800.000
+cache size	: 3072 KB
+physical id	: 0
+siblings	: 4
+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 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 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts md_clear flush_l1d
+vmx flags	: vnmi preemption_timer invvpid ept_x_only flexpriority tsc_offset vtpr mtf vapic ept vpid unrestricted_guest
+bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit srbds
+bogomips	: 5587.01
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 36 bits physical, 48 bits virtual
+power management:

benchmark-data/data/hardware/IntelCorei5-3360M/lscpu.txt

@@ -0,0 +1,35 @@
+Architektura:                    x86_64
+Tryb(y) pracy CPU:               32-bit, 64-bit
+Kolejność bajtów:                Little Endian
+Address sizes:                   36 bits physical, 48 bits virtual
+CPU:                             4
+Lista aktywnych CPU:             0-3
+Wątków na rdzeń:                 2
+Rdzeni na gniazdo:               2
+Gniazd:                          1
+Węzłów NUMA:                     1
+ID producenta:                   GenuineIntel
+Rodzina CPU:                     6
+Model:                           58
+Nazwa modelu:                    Intel(R) Core(TM) i5-3360M CPU @ 2.80GHz
+Wersja:                          9
+CPU MHz:                         1892.718
+CPU max MHz:                     3500,0000
+CPU min MHz:                     1200,0000
+BogoMIPS:                        5587.83
+Wirtualizacja:                   VT-x
+Cache L1d:                       64 KiB
+Cache L1i:                       64 KiB
+Cache L2:                        512 KiB
+Cache L3:                        3 MiB
+Procesory węzła NUMA 0:          0-3
+Vulnerability Itlb multihit:     KVM: Mitigation: VMX disabled
+Vulnerability L1tf:              Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
+Vulnerability Mds:               Mitigation; Clear CPU buffers; SMT vulnerable
+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:        Vulnerable, IBPB: disabled, STIBP: disabled
+Vulnerability Srbds:             Vulnerable: No microcode
+Vulnerability Tsx async abort:   Not affected
+Flagi:                           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 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts md_clear flush_l1d