feat: add spells, character_spells, conditions tables and roll_log metadata

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

server/migrations/002_spells.sql

@@ -0,0 +1,41 @@
+CREATE TABLE IF NOT EXISTS spells (
+  id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+  name VARCHAR(255) NOT NULL,
+  class ENUM('wizard', 'priest', 'both') NOT NULL,
+  tier TINYINT NOT NULL,
+  casting_stat ENUM('INT', 'WIS') NOT NULL,
+  duration VARCHAR(100) NOT NULL DEFAULT 'Instant',
+  range VARCHAR(100) NOT NULL DEFAULT 'Near',
+  is_focus TINYINT NOT NULL DEFAULT 0,
+  description TEXT NOT NULL DEFAULT '',
+  UNIQUE KEY uq_spells_name_class (name, class)
+);
+
+CREATE TABLE IF NOT EXISTS character_spells (
+  id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+  character_id INT UNSIGNED NOT NULL,
+  spell_id INT UNSIGNED NOT NULL,
+  exhausted TINYINT NOT NULL DEFAULT 0,
+  locked_until DATETIME DEFAULT NULL,
+  focus_active TINYINT NOT NULL DEFAULT 0,
+  focus_started_at DATETIME DEFAULT NULL,
+  UNIQUE KEY uq_char_spell (character_id, spell_id),
+  FOREIGN KEY (character_id) REFERENCES characters(id) ON DELETE CASCADE,
+  FOREIGN KEY (spell_id) REFERENCES spells(id) ON DELETE CASCADE
+);
+
+CREATE TABLE IF NOT EXISTS character_conditions (
+  id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+  character_id INT UNSIGNED NOT NULL,
+  name VARCHAR(255) NOT NULL,
+  description TEXT DEFAULT '',
+  rounds_remaining INT DEFAULT NULL,
+  expires_at DATETIME DEFAULT NULL,
+  created_at DATETIME DEFAULT NOW(),
+  FOREIGN KEY (character_id) REFERENCES characters(id) ON DELETE CASCADE
+);
+
+ALTER TABLE roll_log
+  ADD COLUMN IF NOT EXISTS subtype VARCHAR(50) DEFAULT NULL,
+  ADD COLUMN IF NOT EXISTS metadata TEXT DEFAULT NULL,
+  ADD COLUMN IF NOT EXISTS undone TINYINT NOT NULL DEFAULT 0