Add organizations, semantic search, and user personas

From the PR description

Summary

This PR introduces three major features to the platform:

1. Organizations & Team Management - Users can now create organizations, invite team members by email, and manage org-level settings (jurisdictions, practice areas, custom instructions, language).

2. Semantic Search - Documents are now indexed using Voyage AI's legal-optimized embeddings (voyage-law-2), enabling semantic similarity search across document chunks with page number tracking.

3. User Personas - Extended user profiles to capture professional context (role, practice areas, bar number, custom instructions) and organization membership, which enriches LLM system prompts.

Key Changes

Backend

• New routes:

  • POST/GET/PATCH /organizations - Create, retrieve, and update organizations
  • GET /organizations/:id/members - List org members with enriched profile data
  • POST/GET/DELETE /organizations/:id/invites - Manage email-based invitations (7-day expiry)
  • POST /organizations/:id/join - Accept pending invitations
  • POST /search/semantic - Semantic search across documents using embeddings
  • GET/PATCH /user/persona - Fetch and update user persona fields

• New libraries:

  • lib/embeddings.ts - Text chunking (800 chars, 150 overlap), Voyage AI API integration, vector persistence
  • lib/persona.ts - Fetch and build persona context from user + org data
  • lib/llm/openrouter.ts - OpenRouter API client with streaming and tool support

• Database migrations:

  • 001_add_openrouter_voyage.sql - pgvector extension, document_chunks table with 1024-dim embeddings, cosine similarity RPC
  • 002_personas.sql - organizations, organization_members, organization_invites tables; extended user_profiles with persona fields

• Tool additions:

  • Added semantic_search tool to chat tools for LLM-driven document search

Frontend

• New pages:

  • account/company/page.tsx - Full org management UI (create, edit, invite, member list, leave)
  • account/page.tsx - Extended with persona fields (role, practice areas, bar number, custom instructions)

• New components:

  • SemanticSearchWidget.tsx - Debounced search UI with result display and click handlers

• API client updates:

  • Added organization, invite, and persona endpoints to mikeApi.ts
  • Added semantic search endpoint

• Context & utilities:

  • Extended UserProfileContext with persona fields and openrouter API key
  • Updated modelAvailability.ts to support OpenRouter as a provider
  • Updated ModelToggle.tsx to include OpenRouter models

• UI components:

  • Added Textarea component for multi-line inputs

Integration Points

• Chat and project chat routes now fetch and inject persona context into system prompts
• Document upload flow triggers semantic indexing via indexDocumentVersion()
• Model selection now includes OpenRouter models alongside Claude and Gemini
• Project page includes semantic search widget for document discovery

Notable Implementation Details

• Organization invites use email-based upsert with 7-day expiry
• Slugs are auto-generated with random suffix to ensure uniqueness
• Document chunks preserve page numbers from PDF [Page N] markers
• Persona context is hierarchical: user settings override org defaults in prompts
• Semantic search supports filtering by document IDs and configurable result count (top_k)
• OpenRouter client uses OpenAI SDK with custom base URL for compatibility

https://claude.ai/code/session_01NJxa5NasJ9qhaMkzEyqr2u