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/AMDAthlonIIX4640/catproc.txt

@@ -0,0 +1,27 @@
+processor	: 0
+vendor_id	: AuthenticAMD
+cpu family	: 16
+model		: 5
+model name	: AMD Athlon(tm) II X4 640 Processor
+stepping	: 3
+microcode	: 0x10000c8
+cpu MHz		: 800.000
+cache size	: 512 KB
+physical id	: 0
+siblings	: 4
+core id		: 0
+cpu cores	: 4
+apicid		: 0
+initial apicid	: 0
+fpu		: yes
+fpu_exception	: yes
+cpuid level	: 5
+wp		: yes
+flags		: 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 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate vmmcall npt lbrv svm_lock nrip_save
+bugs		: tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs null_seg amd_e400
+bogomips	: 6028.58
+TLB size	: 1024 4K pages
+clflush size	: 64
+cache_alignment	: 64
+address sizes	: 48 bits physical, 48 bits virtual
+power management: ts ttp tm stc 100mhzsteps hwpstate

benchmark-data/data/hardware/AMDAthlonIIX4640/lscpu.txt

@@ -0,0 +1,24 @@
+Architektur:           x86_64
+CPU Operationsmodus:   32-bit, 64-bit
+Byte-Reihenfolge:      Little Endian
+CPU(s):                4
+Liste der Online-CPU(s):0-3
+Thread(s) pro Kern:    1
+Kern(e) pro Socket:    4
+Sockel:                1
+NUMA-Knoten:           1
+Anbieterkennung:       AuthenticAMD
+Prozessorfamilie:      16
+Modell:                5
+Modellname:            AMD Athlon(tm) II X4 640 Processor
+Stepping:              3
+CPU MHz:               800.000
+Maximale Taktfrequenz der CPU:3000,0000
+Minimale Taktfrequenz der CPU:800,0000
+BogoMIPS:              6028.53
+Virtualisierung:       AMD-V
+L1d Cache:             64K
+L1i Cache:             64K
+L2 Cache:              512K
+NUMA-Knoten0 CPU(s):   0-3
+Markierungen:          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 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate vmmcall npt lbrv svm_lock nrip_save