feat(web): add SQLite schema and connection

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

web/server/db/schema.ts

@@ -0,0 +1,49 @@
+export const SCHEMA_SQL = `
+  CREATE TABLE IF NOT EXISTS conversations (
+    id TEXT PRIMARY KEY,
+    title TEXT NOT NULL,
+    account_id TEXT,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+
+  CREATE TABLE IF NOT EXISTS messages (
+    id TEXT PRIMARY KEY,
+    conversation_id TEXT NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
+    role TEXT NOT NULL CHECK(role IN ('user', 'assistant', 'system', 'tool')),
+    content TEXT NOT NULL,
+    tool_calls TEXT,
+    created_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+
+  CREATE TABLE IF NOT EXISTS assets (
+    id TEXT PRIMARY KEY,
+    account_id TEXT,
+    manifest_path TEXT,
+    type TEXT NOT NULL CHECK(type IN ('image', 'video')),
+    file_path TEXT NOT NULL,
+    url TEXT,
+    shot_index INTEGER,
+    created_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+
+  CREATE TABLE IF NOT EXISTS pipeline_runs (
+    id TEXT PRIMARY KEY,
+    manifest_path TEXT NOT NULL,
+    phase TEXT NOT NULL,
+    status TEXT NOT NULL DEFAULT 'pending' CHECK(status IN ('pending','running','done','failed')),
+    started_at TEXT,
+    finished_at TEXT
+  );
+
+  CREATE TABLE IF NOT EXISTS configs (
+    id TEXT PRIMARY KEY,
+    key TEXT NOT NULL UNIQUE,
+    value TEXT NOT NULL DEFAULT '{}',
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+  );
+
+  CREATE INDEX IF NOT EXISTS idx_messages_conv ON messages(conversation_id, created_at);
+  CREATE INDEX IF NOT EXISTS idx_assets_account ON assets(account_id, created_at);
+  CREATE INDEX IF NOT EXISTS idx_pipeline_manifest ON pipeline_runs(manifest_path);
+`;