feat: add evidence-bound product semantic catalog

[seonghobae]

Outcome

• adds normalized product group/model/variant/trade-item catalog identities with scoped GTIN/MPN keys
• validates contextual-orchestrator structured product spans and preserves unique/tie/missing/unavailable resolution
• reuses the durable post-content worker with exact authorized-input digest idempotency
• exposes authorized product evidence in Post detail and adds SHACL/Storybook states

Evidence

• backend focused: 66 passed
• frontend focused/i18n: 65 passed
• new Python modules: 100% targeted coverage
• frontend lint: pass
• Storybook production build: pass
• rendered catalog-review-required story inspected at 1280x720

Stacked on #688; no canonical runtime mutation.

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[seonghobae]

Exact-head audit found and fixed an authorization gap at d8c3251: a visible post could previously return a product span whose evidence_post_id referred to a private post outside the reader scope. The post-detail query now applies the shared source eligibility predicate and account ABAC to every evidence post before returning the mention. A real PostgreSQL/OIDC regression inserts a hidden cross-entity evidence post and proves it is omitted. Product-focused integration/unit checks: 10 passed. The broader documentation pin failure on this stack is inherited from the parent divergence now being reconciled in #693, not suppressed here.

[devin-ai-integration]

Devin Review found 1 new potential issue.