Initial implementation of mcq — document reading queue

Single-binary service: push raw markdown via REST/gRPC API, read rendered
HTML through mobile-friendly web UI. MCIAS auth on all endpoints, SQLite
storage, goldmark rendering with GFM and syntax highlighting.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/db/migrate.go

@@ -0,0 +1,28 @@
+package db
+
+import (
+	mcdsldb "git.wntrmute.dev/mc/mcdsl/db"
+)
+
+// Migrations is the ordered list of MCQ schema migrations.
+var Migrations = []mcdsldb.Migration{
+	{
+		Version: 1,
+		Name:    "documents",
+		SQL: `
+CREATE TABLE IF NOT EXISTS documents (
+    id        INTEGER PRIMARY KEY,
+    slug      TEXT NOT NULL UNIQUE,
+    title     TEXT NOT NULL,
+    body      TEXT NOT NULL,
+    pushed_by TEXT NOT NULL,
+    pushed_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now')),
+    read      INTEGER NOT NULL DEFAULT 0
+);`,
+	},
+}
+
+// Migrate applies all pending migrations.
+func (d *DB) Migrate() error {
+	return mcdsldb.Migrate(d.DB, Migrations)
+}