feat: add TypeGen, SSR transfer state, and LQIP to Angular guide

[nkgentile]

Summary

Builds on #27 to add TypeGen integration, SSR performance, and image optimization guidance to the Angular guide.

• TypeGen: Wrap all queries in defineQuery, add monorepo config note for sanity.cli.ts, type SanityService.fetch with ClientReturn<Query> and QueryParams from @sanity/client to preserve declaration-merged overloads
• SSR Transfer State: Manual TransferState pattern for @sanity/client (Angular's HTTP Transfer Cache only covers HttpClient), with SHA-256 hashed cache keys matching hydrogen-sanity's approach
• LQIP + NgOptimizedImage: Flat image projection preserving @sanity/image-url compatibility, feeding Sanity's base64 LQIP into NgOptimizedImage's placeholder attribute
• Housekeeping: Add Angular to groq.md framework import comment, add Angular row to AGENTS.md knowledge router

Test plan

• Verify all query definitions use defineQuery
• Confirm SanityService.fetch signature uses ClientReturn<Query> from @sanity/client
• Confirm cross-references to typegen.md and image.md are present
• Review SSR TransferState diff is additive to Section 2 service
• Review LQIP projection preserves asset reference for image URL builder

[jwoods02]

All these look like great additions to the skill, nice!