feat: migrate semantic search to pgvector + full-text search

Replace JSON-string embeddings with native pgvector(1536) storage and
add PostgreSQL full-text search (tsvector/GIN) with Reciprocal Rank Fusion
for hybrid keyword + semantic ranking.

Changes:
- NoteEmbedding.embedding: String → vector(1536) via pgvector
- NoteEmbedding: added updatedAt for reindex tracking
- Note: added tsv (tsvector) with auto-update trigger for FTS
- semantic-search.service: hybrid FTS + vector search with RRF fusion
- embedding.service: toVectorString() for pgvector SQL literals
- Removed JS-side cosine similarity loops (now DB-side via <=>)
- Added HNSW index on NoteEmbedding.embedding (cosine distance)
- Added GIN index on Note.tsv for FTS queries

Schema migration in: prisma/migrations/20260512120000_pgvector_and_fts_search/

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

architectural-grid10/src/types.ts

@@ -0,0 +1,34 @@
+export type NavigationView = 'notebooks' | 'agents' | 'settings' | 'shared' | 'reminders' | 'trash';
+export type AITone = 'Professional' | 'Creative' | 'Academic' | 'Casual';
+export type AITab = 'discussion' | 'actions' | 'resources';
+export type SettingsTab = 'general' | 'ai' | 'appearance' | 'profile' | 'data' | 'mcp' | 'about';
+
+export interface Tag {
+  id: string;
+  label: string;
+  type: 'ai' | 'user';
+}
+
+export interface Note {
+  id: string;
+  carnetId: string;
+  title: string;
+  content: string;
+  imageUrl: string;
+  date: string;
+  tags: Tag[];
+  isPinned?: boolean;
+  isDeleted?: boolean;
+  deletedAt?: string;
+}
+
+export interface Carnet {
+  id: string;
+  name: string;
+  initial: string;
+  type: 'Private' | 'Project' | 'Shared';
+  isPrivate?: boolean;
+  parentId?: string;
+  isDeleted?: boolean;
+  deletedAt?: string;
+}