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/IntelXeonE5410/catproc.txt

@@ -0,0 +1,23 @@
+processor	: 0
+vendor_id	: GenuineIntel
+cpu family	: 6
+model		: 23
+model name	: Intel(R) Xeon(R) CPU           E5410  @ 2.33GHz
+stepping	: 10
+cpu MHz		: 2333.497
+cache size	: 6144 KB
+physical id	: 0
+siblings	: 4
+core id		: 0
+cpu cores	: 4
+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 syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm
+bogomips	: 4666.99
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 38 bits physical, 48 bits virtual
+power management:

benchmark-data/data/hardware/IntelXeonE5410/lscpu.txt

@@ -0,0 +1,21 @@
+Architecture:          x86_64
+CPU op-mode(s):        32-bit, 64-bit
+Byte Order:            Little Endian
+CPU(s):                1
+On-line CPU(s) list:   0
+Thread(s) per core:    1
+Core(s) per socket:    1
+CPU socket(s):         1
+NUMA node(s):          1
+Vendor ID:             GenuineIntel
+CPU family:            6
+Model:                 23
+Stepping:              10
+CPU MHz:               2333.414
+BogoMIPS:              4666.82
+Hypervisor vendor:     Xen
+Virtualization type:   para
+L1d cache:             32K
+L1i cache:             32K
+L2 cache:              6144K
+NUMA node0 CPU(s):     0