feat: 新增目标管理功能模块

实现目标管理的完整功能，包括数据库表设计、API接口、业务逻辑和文档说明。支持用户创建、管理和跟踪个人目标，提供增删改查操作及目标完成记录功能。

sql-scripts/goals-tables-create.sql

@@ -0,0 +1,83 @@
+-- 创建目标表
+CREATE TABLE IF NOT EXISTS t_goals (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id VARCHAR(255) NOT NULL,
+  title VARCHAR(255) NOT NULL,
+  description TEXT,
+  repeat_type VARCHAR(20) NOT NULL DEFAULT 'daily' CHECK (repeat_type IN ('daily', 'weekly', 'monthly', 'custom')),
+  frequency INTEGER NOT NULL DEFAULT 1 CHECK (frequency > 0 AND frequency <= 100),
+  custom_repeat_rule JSONB,
+  start_date DATE NOT NULL,
+  end_date DATE,
+  status VARCHAR(20) NOT NULL DEFAULT 'active' CHECK (status IN ('active', 'paused', 'completed', 'cancelled')),
+  completed_count INTEGER NOT NULL DEFAULT 0,
+  target_count INTEGER CHECK (target_count > 0),
+  category VARCHAR(100),
+  priority INTEGER NOT NULL DEFAULT 0 CHECK (priority >= 0 AND priority <= 10),
+  has_reminder BOOLEAN NOT NULL DEFAULT false,
+  reminder_time TIME,
+  reminder_settings JSONB,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  deleted BOOLEAN NOT NULL DEFAULT false
+);
+
+-- 创建目标完成记录表
+CREATE TABLE IF NOT EXISTS t_goal_completions (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  goal_id UUID NOT NULL REFERENCES t_goals(id) ON DELETE CASCADE,
+  user_id VARCHAR(255) NOT NULL,
+  completed_at TIMESTAMP WITH TIME ZONE NOT NULL,
+  completion_count INTEGER NOT NULL DEFAULT 1 CHECK (completion_count > 0),
+  notes TEXT,
+  metadata JSONB,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  deleted BOOLEAN NOT NULL DEFAULT false
+);
+
+-- 创建索引
+CREATE INDEX IF NOT EXISTS idx_goals_user_id ON t_goals(user_id);
+CREATE INDEX IF NOT EXISTS idx_goals_status ON t_goals(status);
+CREATE INDEX IF NOT EXISTS idx_goals_repeat_type ON t_goals(repeat_type);
+CREATE INDEX IF NOT EXISTS idx_goals_category ON t_goals(category);
+CREATE INDEX IF NOT EXISTS idx_goals_start_date ON t_goals(start_date);
+CREATE INDEX IF NOT EXISTS idx_goals_deleted ON t_goals(deleted);
+
+CREATE INDEX IF NOT EXISTS idx_goal_completions_goal_id ON t_goal_completions(goal_id);
+CREATE INDEX IF NOT EXISTS idx_goal_completions_user_id ON t_goal_completions(user_id);
+CREATE INDEX IF NOT EXISTS idx_goal_completions_completed_at ON t_goal_completions(completed_at);
+CREATE INDEX IF NOT EXISTS idx_goal_completions_deleted ON t_goal_completions(deleted);
+
+-- 创建复合索引
+CREATE INDEX IF NOT EXISTS idx_goals_user_status ON t_goals(user_id, status);
+CREATE INDEX IF NOT EXISTS idx_goal_completions_goal_completed ON t_goal_completions(goal_id, completed_at);
+
+-- 添加注释
+COMMENT ON TABLE t_goals IS '用户目标表';
+COMMENT ON COLUMN t_goals.id IS '目标ID';
+COMMENT ON COLUMN t_goals.user_id IS '用户ID';
+COMMENT ON COLUMN t_goals.title IS '目标标题';
+COMMENT ON COLUMN t_goals.description IS '目标描述';
+COMMENT ON COLUMN t_goals.repeat_type IS '重复周期类型：daily-每日，weekly-每周，monthly-每月，custom-自定义';
+COMMENT ON COLUMN t_goals.frequency IS '频率（每天/每周/每月多少次）';
+COMMENT ON COLUMN t_goals.custom_repeat_rule IS '自定义重复规则（如每周几）';
+COMMENT ON COLUMN t_goals.start_date IS '目标开始日期';
+COMMENT ON COLUMN t_goals.end_date IS '目标结束日期';
+COMMENT ON COLUMN t_goals.status IS '目标状态：active-激活，paused-暂停，completed-已完成，cancelled-已取消';
+COMMENT ON COLUMN t_goals.completed_count IS '已完成次数';
+COMMENT ON COLUMN t_goals.target_count IS '目标总次数（null表示无限制）';
+COMMENT ON COLUMN t_goals.category IS '目标分类标签';
+COMMENT ON COLUMN t_goals.priority IS '优先级（数字越大优先级越高）';
+COMMENT ON COLUMN t_goals.has_reminder IS '是否提醒';
+COMMENT ON COLUMN t_goals.reminder_time IS '提醒时间';
+COMMENT ON COLUMN t_goals.reminder_settings IS '提醒设置（如每周几提醒）';
+
+COMMENT ON TABLE t_goal_completions IS '目标完成记录表';
+COMMENT ON COLUMN t_goal_completions.id IS '完成记录ID';
+COMMENT ON COLUMN t_goal_completions.goal_id IS '目标ID';
+COMMENT ON COLUMN t_goal_completions.user_id IS '用户ID';
+COMMENT ON COLUMN t_goal_completions.completed_at IS '完成日期';
+COMMENT ON COLUMN t_goal_completions.completion_count IS '完成次数';
+COMMENT ON COLUMN t_goal_completions.notes IS '完成备注';
+COMMENT ON COLUMN t_goal_completions.metadata IS '完成时的额外数据';