init: 初始化 dpb 桃育种系统代码库

前后端 + 后端 FastAPI 全量源码、部署脚本与文档。

backend/sql/weld_seed_lot.sql

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+-- ============================================================
+-- B8: 选择强度链接线 —— seedling/planting 挂 seed_lot_id（规格 §3.13）
+-- ------------------------------------------------------------
+-- 幂等。bre_seed_lot 表已由 bre_tables.sql 建好。
+-- 链：seed_lot.seed_count → used_count(seedling 按出苗数累加) →
+--     COUNT(seedling WHERE seed_lot_id) → COUNT(tree WHERE planting.seed_lot_id)
+--     → COUNT(selection_result 入选)
+-- ============================================================
+
+ALTER TABLE bre_seedling ADD COLUMN IF NOT EXISTS seed_lot_id integer REFERENCES bre_seed_lot(id);
+CREATE INDEX IF NOT EXISTS ix_bre_seedling_seed_lot_id ON bre_seedling (seed_lot_id);
+
+ALTER TABLE bre_planting ADD COLUMN IF NOT EXISTS seed_lot_id integer REFERENCES bre_seed_lot(id);
+CREATE INDEX IF NOT EXISTS ix_bre_planting_seed_lot_id ON bre_planting (seed_lot_id);