feat(admin-brand): add question expansion service and related functionality

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- Implemented QuestionExpansionService for generating and materializing questions based on combinations and AI distillation.
- Added question metadata classification logic to infer intent and layer of questions.
- Created API handlers for question expansion operations including combination preview, AI distillation, metadata classification, and materialization.
- Introduced database migrations to support new question-related fields and constraints in brand_questions and brand_keywords tables.
- Added caching mechanism for AI distillation results to improve performance.
- Defined JSON schemas for question distillation responses to ensure data integrity.

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liangxu

2026-05-12 21:53:36 +08:00

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commit 37b0b32327

27 changed files with 4619 additions and 908 deletions

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docs/superpowers/specs/2026-05-12-keyword-expansion-design.md

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