Document business effect amount prompt fix

RuoYi-Vue/docs/superpowers/specs/2026-06-18-business-effect-amount-prompt-fix-design.md

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+# Business Effect Amount Prompt Fix Design
+
+## Problem
+
+Business blueprint generation can fail with `Business effect amount is invalid`.
+The validator correctly limits `INCREASE_NUMBER` and `DECREASE_NUMBER` amounts to
+numeric literals or `${param.field}` placeholders, but neither the initial AI
+prompt nor the correction prompt states that contract explicitly.
+
+The dynamic prompt example also contains no numeric effect, so the model may
+return an empty amount or an arithmetic expression such as `stock - 1`. A single
+correction attempt receives the same incomplete guidance and can fail again.
+
+## Scope
+
+Keep the existing safe DSL and validator unchanged. Add one shared prompt
+constraint that is included in both initial generation and correction prompts:
+
+- `INCREASE_NUMBER` and `DECREASE_NUMBER` require `targetTable`, `targetField`,
+  `conditionFields`, and a non-empty `amount`.
+- `amount`, `minValue`, and `NUMBER_GTE.compareValue` may only be numeric
+  literals or `${param.saved_column}` placeholders.
+- Arithmetic expressions such as `stock - 1`, SQL fragments, units, and
+  descriptive text are forbidden.
+- `DECREASE_NUMBER.minValue` may be omitted; the generated runtime already
+  defaults it to zero.
+
+Do not infer or default a missing amount because that could silently change
+business behavior.
+
+## Implementation
+
+Extract the numeric-expression guidance into a small prompt helper in
+`AiGenerateServiceImpl`. Call it from both `buildBusinessBlueprintPrompt` and
+`buildBusinessBlueprintCorrectionPrompt`.
+
+No DTO, persistence, template, or validator changes are required.
+
+## Testing
+
+Add regression assertions proving:
+
+1. The initial business-blueprint prompt describes the allowed numeric forms
+   and rejects arithmetic expressions.
+2. A correction prompt produced after an invalid amount contains the same
+   numeric constraint and the validation error.
+3. Existing valid numeric effects still parse and persist.
+
+Run the targeted `AiGenerateServiceImplTest` suite, followed by the generator
+module tests if the targeted suite passes.