Store YAML frontmatter in notes.

migrations/add_cascade_delete_note_links_sqlite.sql

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+-- SQLite migration for cascade delete on note_link
+-- SQLite doesn't support ALTER TABLE for foreign keys, so we need to recreate the table
+
+-- Create new table with CASCADE delete
+CREATE TABLE note_link_new (
+    id INTEGER PRIMARY KEY,
+    source_note_id INTEGER NOT NULL,
+    target_note_id INTEGER NOT NULL,
+    link_type VARCHAR(50) DEFAULT 'related',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    created_by_id INTEGER NOT NULL,
+    FOREIGN KEY (source_note_id) REFERENCES note(id) ON DELETE CASCADE,
+    FOREIGN KEY (target_note_id) REFERENCES note(id) ON DELETE CASCADE,
+    FOREIGN KEY (created_by_id) REFERENCES user(id),
+    UNIQUE(source_note_id, target_note_id)
+);
+
+-- Copy data from old table
+INSERT INTO note_link_new SELECT * FROM note_link;
+
+-- Drop old table
+DROP TABLE note_link;
+
+-- Rename new table
+ALTER TABLE note_link_new RENAME TO note_link;