添加部分注释，修复一些功能

hydro/interface.js

@@ -0,0 +1,72 @@
+const { ObjectID } = require('bson');
+exports.udoc = {
+    _id: 0,
+    mail: '',
+    mailLower: '',
+    uname: '',
+    unameLower: '',
+    salt: '',
+    hash: '',
+    hashType: 'hydro',
+    nAccept: 0,
+    nSubmit: 0,
+    nLike: 0,
+    bio: '',
+    gender: 0,
+    regat: new Date(),
+    regip: '0.0.0.0',
+    gravatar: '',
+    loginat: new Date(),
+    loginip: '0.0.0.0'
+};
+/*
+export interface Pdoc {
+    _id: ObjectID
+    pid: string
+    owner: number
+    title: string
+    content: string
+    nSubmit: number
+    nAccept: number
+    tag: string[]
+    category: string[],
+    data: ObjectID | null
+    hidden: boolean
+}
+export interface TestCase {
+    time: number,
+    memory: number,
+    status: number,
+    message: string
+}
+export interface Rdoc {
+    _id: ObjectID,
+    pid: ObjectID,
+    owner: number,
+    lang: string,
+    code: string,
+    score: number,
+    memory: number,
+    time: number,
+    judgeTexts: string[],
+    compilerTexts: string[],
+    testCases: TestCase[],
+    rejudged: boolean,
+    judger: string,
+    judgeAt: Date,
+    status: number
+}
+export interface Bdoc {
+    _id: string,
+    expireAt: Date
+}
+export interface Tdoc {
+    _id: ObjectID
+    beginAt: Date
+    endAt: Date
+    attend: number
+    title: string
+    content: string
+    pids: ObjectID[]
+}
+*/