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T741 — product demand term suggestions

Status: done
Milestone: M4 · Phase C
Kind: feat · Est. change: ~180 lines

Goal

依選定 Brand／Product 產出可追溯 basis 的需求詞與排除詞，而不是只搜尋品牌／產品名。

Depends on

T740

Inputs

apps/backend/internal/module/radar/usecase/suggest.go
../spec.md §4.1、§5.2
Threads searchable short-term rules

Outputs

路徑	動作	說明
`apps/backend/internal/module/radar/usecase/suggest.go`	edit	product context prompt／fallback／basis output
`apps/backend/internal/logic/radar/suggest_watch_terms_logic.go`	edit	成對 IDs 與 mapping
suggestion tests	edit/add	pain/scenario/include/exclude／short-term cases

Behavior

basis_kind 只來自 audience／pain／context／tag／capability／exclude。
品牌名與產品名只能輔助，不得是唯一建議理由。
AI 失敗時明確錯誤或合法 fallback，不回空成功；計費沿用 radar.suggest。

Out of scope

建立 watch（T750）
自動採用建議

Acceptance

每個 include suggestion 有 basis，全部通過短詞規則。

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

Implementation result (2026-08-10): paired Brand／Product requests now load an immutable owned context, charge through radar.suggest, and return traceable basis_kind／basis_text. Provider responses are structurally filtered; when AI is unavailable or unusable, deterministic catalog terms are returned with the same short-term and provenance rules. Unpaired IDs and empty fallback contexts fail explicitly.

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