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/server/db/migrations/0000_large_master_chief.sql

@@ -0,0 +1,104 @@
+CREATE TABLE `documents` (
+	`id` text PRIMARY KEY NOT NULL,
+	`repository_id` text NOT NULL,
+	`version_id` text,
+	`file_path` text NOT NULL,
+	`title` text,
+	`language` text,
+	`token_count` integer DEFAULT 0,
+	`checksum` text NOT NULL,
+	`indexed_at` integer NOT NULL,
+	FOREIGN KEY (`repository_id`) REFERENCES `repositories`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`version_id`) REFERENCES `repository_versions`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `indexing_jobs` (
+	`id` text PRIMARY KEY NOT NULL,
+	`repository_id` text NOT NULL,
+	`version_id` text,
+	`status` text DEFAULT 'queued' NOT NULL,
+	`progress` integer DEFAULT 0,
+	`total_files` integer DEFAULT 0,
+	`processed_files` integer DEFAULT 0,
+	`error` text,
+	`started_at` integer,
+	`completed_at` integer,
+	`created_at` integer NOT NULL,
+	FOREIGN KEY (`repository_id`) REFERENCES `repositories`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `repositories` (
+	`id` text PRIMARY KEY NOT NULL,
+	`title` text NOT NULL,
+	`description` text,
+	`source` text NOT NULL,
+	`source_url` text NOT NULL,
+	`branch` text DEFAULT 'main',
+	`state` text DEFAULT 'pending' NOT NULL,
+	`total_snippets` integer DEFAULT 0,
+	`total_tokens` integer DEFAULT 0,
+	`trust_score` real DEFAULT 0,
+	`benchmark_score` real DEFAULT 0,
+	`stars` integer,
+	`github_token` text,
+	`last_indexed_at` integer,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `repository_configs` (
+	`repository_id` text PRIMARY KEY NOT NULL,
+	`project_title` text,
+	`description` text,
+	`folders` text,
+	`exclude_folders` text,
+	`exclude_files` text,
+	`rules` text,
+	`previous_versions` text,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`repository_id`) REFERENCES `repositories`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `repository_versions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`repository_id` text NOT NULL,
+	`tag` text NOT NULL,
+	`title` text,
+	`state` text DEFAULT 'pending' NOT NULL,
+	`total_snippets` integer DEFAULT 0,
+	`indexed_at` integer,
+	`created_at` integer NOT NULL,
+	FOREIGN KEY (`repository_id`) REFERENCES `repositories`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `settings` (
+	`key` text PRIMARY KEY NOT NULL,
+	`value` text,
+	`updated_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `snippet_embeddings` (
+	`snippet_id` text PRIMARY KEY NOT NULL,
+	`model` text NOT NULL,
+	`dimensions` integer NOT NULL,
+	`embedding` blob NOT NULL,
+	`created_at` integer NOT NULL,
+	FOREIGN KEY (`snippet_id`) REFERENCES `snippets`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE TABLE `snippets` (
+	`id` text PRIMARY KEY NOT NULL,
+	`document_id` text NOT NULL,
+	`repository_id` text NOT NULL,
+	`version_id` text,
+	`type` text NOT NULL,
+	`title` text,
+	`content` text NOT NULL,
+	`language` text,
+	`breadcrumb` text,
+	`token_count` integer DEFAULT 0,
+	`created_at` integer NOT NULL,
+	FOREIGN KEY (`document_id`) REFERENCES `documents`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`repository_id`) REFERENCES `repositories`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`version_id`) REFERENCES `repository_versions`(`id`) ON UPDATE no action ON DELETE cascade
+);