docs(database): 规范脚本顺序并补全字段注释

script/sql/16.agent_capability_binding.sql

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+-- Agent 与 Workflow 能力绑定表。
+
+CREATE TABLE IF NOT EXISTS agent_capability_binding (
+    id BIGSERIAL PRIMARY KEY,
+    owner_type VARCHAR(50) NOT NULL,
+    owner_id BIGINT NOT NULL,
+    capability_type VARCHAR(50) NOT NULL,
+    capability_id BIGINT NOT NULL,
+    enabled BOOLEAN NOT NULL DEFAULT TRUE,
+    config_json JSONB NOT NULL DEFAULT '{}'::jsonb,
+    version INTEGER NOT NULL DEFAULT 1,
+    create_time TIMESTAMP,
+    update_time TIMESTAMP,
+    remark VARCHAR(500) DEFAULT '',
+    create_by VARCHAR(64),
+    update_by VARCHAR(64),
+    CONSTRAINT uk_agent_capability_binding UNIQUE (owner_type, owner_id, capability_type, capability_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_agent_capability_owner ON agent_capability_binding (owner_type, owner_id);
+CREATE INDEX IF NOT EXISTS idx_agent_capability_type ON agent_capability_binding (capability_type, capability_id);
+
+COMMENT ON TABLE agent_capability_binding IS 'Agent能力绑定表';
+COMMENT ON COLUMN agent_capability_binding.id IS 'ID';
+COMMENT ON COLUMN agent_capability_binding.owner_type IS '绑定主体类型';
+COMMENT ON COLUMN agent_capability_binding.owner_id IS '绑定主体ID';
+COMMENT ON COLUMN agent_capability_binding.capability_type IS '能力类型';
+COMMENT ON COLUMN agent_capability_binding.capability_id IS '能力ID';
+COMMENT ON COLUMN agent_capability_binding.enabled IS '是否启用';
+COMMENT ON COLUMN agent_capability_binding.config_json IS '绑定配置JSON';
+COMMENT ON COLUMN agent_capability_binding.version IS '版本';
+COMMENT ON COLUMN agent_capability_binding.create_time IS '创建时间';
+COMMENT ON COLUMN agent_capability_binding.update_time IS '更新时间';
+COMMENT ON COLUMN agent_capability_binding.remark IS '备注';
+COMMENT ON COLUMN agent_capability_binding.create_by IS '创建者';
+COMMENT ON COLUMN agent_capability_binding.update_by IS '更新者';