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T740 — product context snapshot loader

Status: done
Milestone: M4 · Phase C
Kind: feat · Est. change: ~170 lines

Goal

從同 owner 的 Brand／Product 載入產品判定上下文並建立不可回寫舊商機的版本快照。

Depends on

T734

Inputs

Scout Brand／Product domain repositories
../spec.md §3.1、§3.3、§4.2

Outputs

路徑	動作	說明
`apps/backend/internal/module/radar/usecase/product_context.go`	add	owner/parent validation、snapshot construction
`apps/backend/internal/module/radar/usecase/service.go`	edit	注入 Brand/Product source interface
`apps/backend/internal/module/radar/usecase/product_context_test.go`	add	missing／wrong owner／version snapshot

Behavior

snapshot 只含判定與歷史解釋必要資料及 source updated_at。
Product 不存在／錯 Brand 明確失敗；不得退回 ServiceProfile product fit。
ServiceProfile 只提供選用 regions／remote／forbidden／tone。

Out of scope

建議詞與 scoring
watch auto pause（T755）

Acceptance

更新 Product 後新 snapshot 改版，舊 snapshot fixture 不變。

cd apps/backend && go test ./internal/module/radar/usecase/... -count=1

Implementation result (2026-08-10): added a read-only Scout catalog bridge, owner/parent validation, and immutable Brand/Product context snapshots with source updated-at versions.

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