feat: improve SEO

[isadorable-png]

This branch mainly improves titles/descriptions and social previews, adds structured data where it helps (home, DAO home, FAQ, glossary), adds llms.txt, tightens sitemap/robots, and makes proposal pages use real proposal copy in metadata, plus off-chain proposal OG images.

Request Document ↗️

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Site-wide / plumbing

• shared/seo/site.ts — getSiteUrl() / helpers so metadata and JSON-LD use a consistent absolute base URL.
• shared/seo/graphql.ts — Server-side GraphQL helpers to load proposal titles/descriptions (on-chain and off-chain) for generateMetadata.
• shared/seo/JsonLd.tsx — Small component to inject <script type="application/ld+json">.
• app/layout.tsx — Stronger default metadata (metadataBase, keywords, Open Graph / Twitter copy aligned with the product).

Crawling & discovery

• app/sitemap.ts — Adjusted how static and dynamic URLs are emitted (still driven by DAO config + proposal paths where applicable).
• app/robots.ts — Tweaked rules for crawlers.
• app/llms.txt/route.ts — New /llms.txt plain-text file pointing at important URLs (site, FAQ, glossary, contact, terms, DAO home pages).

Home & global marketing surface

• app/page.tsx — Refined title/description (including OG/Twitter) and SoftwareApplication JSON-LD.
• DAO area
• app/[daoId]/(main)/page.tsx — DAO overview metadata plus SoftwareApplication JSON-LD for that DAO dashboard.
• app/[daoId]/(main)/activity-feed/page.tsx — Richer, DAO-specific title/description and explicit Open Graph + Twitter fields (not only og:url).

Governance / proposals

• .../governance/proposal/[proposalId]/page.tsx — Dynamic metadata from getOnchainProposalSeoData (with sensible fallbacks).
• .../governance/offchain-proposal/[proposalId]/page.tsx — Same pattern with getOffchainProposalSeoData and decoded proposal id.
• .../proposal/[proposalId]/opengraph-image.tsx — Small OG image label tweak for proposals.
• .../offchain-proposal/[proposalId]/opengraph-image.tsx — New OG image route for off-chain proposal URLs (aligned with other DAO section images).

Static content pages

• app/faq/page.tsx — FAQPage JSON-LD built from existing FAQ items (plus metadata wiring as in the diff).
• app/glossary/page.tsx — DefinedTermSet / DefinedTerm JSON-LD; minor description text normalization; renders JsonLd next to the client glossary UI.
• app/terms-of-service/page.tsx — Clearer, more descriptive title + description (including OG/Twitter).

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