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/IntelCorei7-2700K/catproc.txt

@@ -0,0 +1,26 @@
+processor	: 0
+vendor_id	: GenuineIntel
+cpu family	: 6
+model		: 42
+model name	: Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz
+stepping	: 7
+microcode	: 0x2f
+cpu MHz		: 2738.047
+cache size	: 8192 KB
+physical id	: 0
+siblings	: 8
+core id		: 0
+cpu cores	: 4
+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 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 est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt tsc_deadline_timer aes xsave avx lahf_lm epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid 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
+bogomips	: 6984.47
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 36 bits physical, 48 bits virtual
+power management:

benchmark-data/data/hardware/IntelCorei7-2700K/lscpu.txt

@@ -0,0 +1,34 @@
+Architecture:                    x86_64
+CPU op-mode(s):                  32-bit, 64-bit
+Byte Order:                      Little Endian
+Address sizes:                   36 bits physical, 48 bits virtual
+CPU(s):                          8
+On-line CPU(s) list:             0-7
+Thread(s) per core:              2
+Core(s) per socket:              4
+Socket(s):                       1
+NUMA node(s):                    1
+Vendor ID:                       GenuineIntel
+CPU family:                      6
+Model:                           42
+Model name:                      Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz
+Stepping:                        7
+CPU MHz:                         1685.442
+CPU max MHz:                     3900.0000
+CPU min MHz:                     1600.0000
+BogoMIPS:                        6984.47
+Virtualization:                  VT-x
+L1d cache:                       128 KiB
+L1i cache:                       128 KiB
+L2 cache:                        1 MiB
+L3 cache:                        8 MiB
+NUMA node0 CPU(s):               0-7
+Vulnerability Itlb multihit:     KVM: Mitigation: Split huge pages
+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:        Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP conditional, RSB filling
+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 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 est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 popcnt tsc_deadline_timer aes xsave avx lahf_lm epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid xsaveopt dtherm ida arat pln pts md_clear flush_l1d