feat(TRUEREF-0001): implement complete database schema and core data models

Define all SQLite tables via Drizzle ORM (repositories, repository_versions,
documents, snippets, snippet_embeddings, indexing_jobs, repository_configs,
settings), generate the initial migration, create FTS5 virtual table and
sync triggers in fts.sql, add shared TypeScript types in src/lib/types.ts,
and write 21 unit tests covering insertions, cascade deletes, FK constraints,
blob storage, JSON fields, and FTS5 trigger behaviour.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/types.ts

@@ -0,0 +1,96 @@
+/**
+ * Shared domain types for TrueRef.
+ * These re-export and extend the Drizzle-inferred schema types with
+ * application-level conveniences.
+ */
+
+export type {
+	Repository,
+	NewRepository,
+	RepositoryVersion,
+	NewRepositoryVersion,
+	Document,
+	NewDocument,
+	Snippet,
+	NewSnippet,
+	SnippetEmbedding,
+	NewSnippetEmbedding,
+	IndexingJob,
+	NewIndexingJob,
+	RepositoryConfig,
+	NewRepositoryConfig,
+	Settings,
+	NewSettings
+} from './server/db/schema';
+
+// ---------------------------------------------------------------------------
+// Application-level union types (narrower than raw DB enums)
+// ---------------------------------------------------------------------------
+
+export type RepositorySource = 'github' | 'local';
+export type RepositoryState = 'pending' | 'indexing' | 'indexed' | 'error';
+export type SnippetType = 'code' | 'info';
+export type JobStatus = 'queued' | 'running' | 'done' | 'failed';
+export type VersionState = 'pending' | 'indexing' | 'indexed' | 'error';
+
+// ---------------------------------------------------------------------------
+// API / service layer types
+// ---------------------------------------------------------------------------
+
+/** Payload accepted by the repository management service when adding a repo. */
+export interface AddRepositoryInput {
+	id: string;
+	title: string;
+	description?: string;
+	source: RepositorySource;
+	sourceUrl: string;
+	branch?: string;
+	githubToken?: string;
+}
+
+/** Lightweight repository summary returned in list endpoints. */
+export interface RepositorySummary {
+	id: string;
+	title: string;
+	description: string | null;
+	source: RepositorySource;
+	state: RepositoryState;
+	totalSnippets: number;
+	totalTokens: number;
+	trustScore: number;
+	stars: number | null;
+	lastIndexedAt: Date | null;
+}
+
+/** Snippet returned from search results. */
+export interface SearchResultSnippet {
+	id: string;
+	repositoryId: string;
+	documentId: string;
+	type: SnippetType;
+	title: string | null;
+	content: string;
+	language: string | null;
+	breadcrumb: string | null;
+	tokenCount: number;
+	score?: number;
+}
+
+/** Search request parameters. */
+export interface SearchQuery {
+	query: string;
+	libraryId?: string;
+	type?: SnippetType;
+	limit?: number;
+}
+
+/** Parsed trueref.json / context7.json configuration. */
+export interface TrueRefConfig {
+	projectTitle?: string;
+	description?: string;
+	folders?: string[];
+	excludeFolders?: string[];
+	excludeFiles?: string[];
+	rules?: string[];
+	previousVersions?: Array<{ tag: string; title: string }>;
+}