Split local data stores and analysis configuration

[dills122]

Summary

• Finishes the current refactor pass by splitting browser local data storage and analysis configuration into focused modules.
• Documents the config/constants-driven standard for future work.

What Changed

• Replaced apps/web/src/lib/db.ts with a small public facade.
• Added focused local data modules for schema, repositories, import events, analysis results, local profile, operation locks, and reset behavior.
• Extracted analysis plan/version constants into analysis-config.ts.
• Extracted category rules into category-config.ts.
• Extracted scoring weights, thresholds, penalties, and label cutoffs into scoring-config.ts.
• Updated code audit and steering docs to capture completed refactors and the no-magic-values standard.

Validation

• pnpm --filter @forage/web test -- db.test.ts local-operation-lock.test.ts
• pnpm --filter @forage/web typecheck
• pnpm --filter @forage/analysis test
• pnpm --filter @forage/analysis typecheck
• npm run check:analysis
• npm run check:docs
• npm run check:workspace
• pnpm lint
• pnpm check

Scope Notes

• This is a behavior-preserving refactor.
• Existing imports from apps/web/src/lib/db.ts remain stable through the facade.
• Analysis behavior is unchanged; rules, weights, thresholds, and versions are now config-driven.