feat(lyra): 接入 PostgreSQL 与 Goose 迁移

- 使用 pgx/sqlx 建立连接，从环境变量读取数据库密码
- 添加本地 PostgreSQL Compose 配置与初始迁移
- 补充 Goose 操作手册和连接串排错说明

go/projects/lyra/docs/demo.sql

@@ -71,16 +71,12 @@ CREATE TABLE public.links (
     pinned_sort integer,
     created_at  timestamptz NOT NULL DEFAULT now(),
     updated_at  timestamptz NOT NULL DEFAULT now(),
-    CONSTRAINT links_category_fk
-        FOREIGN KEY (category_id) REFERENCES public.categories (id)
-        ON DELETE RESTRICT,
+    CONSTRAINT links_category_fk FOREIGN KEY (category_id) REFERENCES public.categories (id) ON DELETE RESTRICT,
     CONSTRAINT links_title_not_empty CHECK (btrim(title) <> ''),
     CONSTRAINT links_url_not_empty CHECK (btrim(url) <> ''),
     CONSTRAINT links_pinned_sort_consistent CHECK (pinned = (pinned_sort IS NOT NULL)),
-    CONSTRAINT links_keywords_one_dimension
-        CHECK (cardinality(keywords) = 0 OR array_ndims(keywords) = 1),
-    CONSTRAINT links_keywords_no_null_elements
-        CHECK (array_position(keywords, NULL) IS NULL)
+    CONSTRAINT links_keywords_one_dimension CHECK (cardinality(keywords) = 0 OR array_ndims(keywords) = 1),
+    CONSTRAINT links_keywords_no_null_elements CHECK (array_position(keywords, NULL) IS NULL)
 );
 
 COMMENT ON TABLE public.links IS '链接表，归属分类';