chore: bootstrap housing research platform

data/sample/area_monthly_metrics.csv

@@ -0,0 +1,16 @@
+area_id,month,transaction_count,transaction_price_psm,listing_count,listing_price_psm,median_days_on_market,rent_price_psm,new_supply_units,land_residential_gfa_sqm,mortgage_rate_pct,policy_signal,source
+qiantan,2026-03,78,119000,410,125000,62,188,120,0,3.45,1,sample
+qiantan,2026-04,86,121000,398,126000,58,190,80,0,3.40,1,sample
+qiantan,2026-05,93,122500,380,126500,53,192,60,0,3.35,1,sample
+xujiahui,2026-03,64,126000,355,132000,68,205,30,0,3.45,1,sample
+xujiahui,2026-04,62,126800,360,132500,70,206,20,0,3.40,1,sample
+xujiahui,2026-05,67,127500,348,133000,66,207,20,0,3.35,1,sample
+danning,2026-03,91,96000,520,101000,76,155,180,12000,3.45,1,sample
+danning,2026-04,98,97000,505,101500,72,156,130,0,3.40,1,sample
+danning,2026-05,103,98200,488,102200,69,158,110,0,3.35,1,sample
+zhangjiang,2026-03,105,82000,610,87500,70,135,260,36000,3.45,1,sample
+zhangjiang,2026-04,118,83500,590,88200,64,137,220,0,3.40,1,sample
+zhangjiang,2026-05,126,84600,570,89000,60,139,180,0,3.35,1,sample
+hongqiao,2026-03,83,76000,690,82000,88,118,420,68000,3.45,0,sample
+hongqiao,2026-04,79,75500,720,81800,94,118,390,0,3.40,0,sample
+hongqiao,2026-05,82,75800,735,82000,96,119,360,0,3.35,0,sample

data/sample/areas.csv

@@ -0,0 +1,6 @@
+area_id,name,district,segment,notes
+qiantan,前滩,浦东新区,核心改善,产业和公共配套强，供应节奏需要持续跟踪
+xujiahui,徐家汇,徐汇区,核心成熟,成熟商圈和教育医疗资源强，价格弹性通常较小
+danning,大宁,静安区,内中环改善,居住氛围和商业配套较均衡
+zhangjiang,张江,浦东新区,产业成长,产业人口支撑强，产品分化明显
+hongqiao,大虹桥,闵行区,规划成长,受商务区兑现和供应影响较大

data/sample/neighborhood_monthly_metrics.csv

@@ -0,0 +1,6 @@
+neighborhood_id,month,transaction_count,transaction_price_psm,listing_count,listing_price_psm,rent_price_psm,median_days_on_market,available_units,source
+qiantan_a,2026-05,12,124000,38,128000,195,50,38,sample
+xujiahui_a,2026-05,8,131000,30,137000,215,62,30,sample
+danning_a,2026-05,14,100000,45,104000,162,65,45,sample
+zhangjiang_a,2026-05,18,86000,58,90500,143,58,58,sample
+hongqiao_a,2026-05,9,77000,76,83500,121,94,76,sample

data/sample/neighborhoods.csv

@@ -0,0 +1,6 @@
+neighborhood_id,area_id,name,built_year,property_type,metro_distance_m,school_quality,notes
+qiantan_a,qiantan,前滩样例小区A,2018,商品住宅,450,good,演示样例
+xujiahui_a,xujiahui,徐家汇样例小区A,2008,商品住宅,300,excellent,演示样例
+danning_a,danning,大宁样例小区A,2015,商品住宅,600,good,演示样例
+zhangjiang_a,zhangjiang,张江样例小区A,2016,商品住宅,700,normal,演示样例
+hongqiao_a,hongqiao,大虹桥样例小区A,2020,商品住宅,900,normal,演示样例