feat: repo fetch refactor with platform abstraction, branch support, and D1 config fix

[khrees]

Refactors repository fetching and ingestion with a platform abstraction layer, plus several incremental improvements to the explore flow.

• Introduces platform abstraction (D1, KV, R2) with local SQLite fallback for dev
• Adds branch selection to ingestion and exploration
• Adds startSha / clearExisting params for sliding window ingestion and commit pinning
• Fetches file-specific diffs via API to optimize diff loading
• Adds TanStack Query hooks and Zustand store for AI settings and repo data
• Adds toast notifications for repo sync and AI config
• Redesigns explore page header and implements session-based repo access grants
• Fixes wrangler.toml: corrects D1 binding name (DB → grepbase_db) and moves migrations_dir into the [[d1_databases]] block

[vercel]

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Project	Deployment	Actions	Updated (UTC)
grepbase	Ready	Preview, Comment	Apr 4, 2026 0:23am