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/AmpereAltraARMv8Neoverse-N1160-Core/catproc.txt

@@ -0,0 +1,8 @@
+processor	: 0
+BogoMIPS	: 50.00
+Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp ssbs
+CPU implementer	: 0x41
+CPU architecture: 8
+CPU variant	: 0x3
+CPU part	: 0xd0c
+CPU revision	: 1

benchmark-data/data/hardware/AmpereAltraARMv8Neoverse-N1160-Core/lscpu.txt

@@ -0,0 +1,38 @@
+Architecture:                    aarch64
+CPU op-mode(s):                  32-bit, 64-bit
+Byte Order:                      Little Endian
+CPU(s):                          160
+On-line CPU(s) list:             0-159
+Thread(s) per core:              1
+Core(s) per socket:              80
+Socket(s):                       2
+NUMA node(s):                    8
+Vendor ID:                       ARM
+Model:                           1
+Model name:                      Neoverse-N1
+Stepping:                        r3p1
+Frequency boost:                 enabled
+CPU max MHz:                     3300.0000
+CPU min MHz:                     1000.0000
+BogoMIPS:                        50.00
+L1d cache:                       10 MiB
+L1i cache:                       10 MiB
+L2 cache:                        160 MiB
+NUMA node0 CPU(s):               0-19
+NUMA node1 CPU(s):               20-39
+NUMA node2 CPU(s):               40-59
+NUMA node3 CPU(s):               60-79
+NUMA node4 CPU(s):               80-99
+NUMA node5 CPU(s):               100-119
+NUMA node6 CPU(s):               120-139
+NUMA node7 CPU(s):               140-159
+Vulnerability Itlb multihit:     Not affected
+Vulnerability L1tf:              Not affected
+Vulnerability Mds:               Not affected
+Vulnerability Meltdown:          Not affected
+Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
+Vulnerability Spectre v1:        Mitigation; __user pointer sanitization
+Vulnerability Spectre v2:        Not affected
+Vulnerability Srbds:             Not affected
+Vulnerability Tsx async abort:   Not affected
+Flags:                           fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp ssbs