feat(admin): complete decoration module database integration including DIY pages, RLS and RPCs

docs/sql/10_schema/decoration/ak_diy_pages_v1.sql

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+-- =====================================================================================
+-- Schema: 装修模块 - DIY 页面配置表
+-- 位置：docs/sql/10_schema/decoration/ak_diy_pages_v1.sql
+-- 对象类型：TABLE
+-- 版本：v1
+-- 说明：存储首页、专题页及个人中心的 DIY 布局 JSON 配置
+-- =====================================================================================
+
+CREATE TABLE IF NOT EXISTS public.ak_diy_pages (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name TEXT NOT NULL,
+    type TEXT NOT NULL,             -- home: 首页, topic: 专题页, user: 个人中心
+    
+    config JSONB NOT NULL DEFAULT '{}'::jsonb, -- 核心布局配置 (组件列表及参数)
+    
+    is_home BOOLEAN NOT NULL DEFAULT FALSE,    -- 是否为生效首页
+    is_active BOOLEAN NOT NULL DEFAULT TRUE,   -- 是否启用
+    
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    created_by UUID REFERENCES public.ak_users(id),
+    updated_by UUID REFERENCES public.ak_users(id)
+);
+
+-- 索引
+CREATE INDEX IF NOT EXISTS idx_diy_pages_type ON public.ak_diy_pages (type);
+CREATE INDEX IF NOT EXISTS idx_diy_pages_is_home ON public.ak_diy_pages (is_home) WHERE is_home = TRUE;
+
+-- 注释
+COMMENT ON TABLE public.ak_diy_pages IS 'DIY 页面装修配置表';
+COMMENT ON COLUMN public.ak_diy_pages.type IS '页面类型: home(首页), topic(专题), user(个人中心)';
+COMMENT ON COLUMN public.ak_diy_pages.config IS 'DIY 布局配置 JSON';