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T743 — product fit ai structured fallback

Status: done
Milestone: M4 · Phase C
Kind: feat · Est. change: ~190 lines

Goal

產品適配優先使用結構化 AI 判定，輸出不完整時安全回 deterministic scorer，不保存腦補證據。

Depends on

T741、T742

Inputs

apps/backend/internal/module/radar/usecase/judge.go、AI provider abstraction
../spec.md §3.2、§8

Outputs

路徑	動作	說明
`apps/backend/internal/module/radar/usecase/product_fit_ai.go`	add	prompt、JSON parse、evidence validation、fallback
`apps/backend/internal/module/radar/usecase/judge.go`	edit	product mode 接 fit；generic 保留舊 fit
AI tests	add	valid／missing dimensions／invented excerpt／provider failure

Behavior

excerpt 必須可在候選文字找到；basis 必須可在 snapshot 找到。
AI 結果缺契約即丟棄，fallback 仍需四維完整。
新 match 計 ai_research／radar.product_fit；既有 generic 計費不變。

Out of scope

merge 與 primary（T744）
準確度樣本（T773）

Acceptance

provider failure 不產生空 reasons，且 token 不當會員 auth。

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

Implementation result (2026-08-10): product watches now attach a structured four-dimension fit during judging and meter it as ai_research／ radar.product_fit. AI output is accepted only when every positive excerpt is found in the candidate and every basis exists in the immutable snapshot; malformed, invented, or provider-failed responses fall back to T742's deterministic scorer, preserving complete reasons and hard exclusions.

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