feat(chat): add chat room management functionality

- Created new chat schema in the database.
- Implemented chat room model with necessary fields (title, ownerId, roomTypeId, etc.).
- Added room type model and rights model for chat functionality.
- Developed API endpoints for managing chat rooms, including create, edit, and delete operations.
- Integrated chat room management into the admin interface with a dedicated view and dialog for room creation/editing.
- Added internationalization support for chat room management UI.
- Implemented autocomplete for victim selection in underground activities.
- Enhanced the underground view with new activity types and political target selection.

backend/models/chat/rights.js

@@ -0,0 +1,22 @@
+import { DataTypes } from 'sequelize';
+import { sequelize } from '../../utils/sequelize.js';
+
+const ChatRight = sequelize.define('ChatRight', {
+    id: {
+        type: DataTypes.INTEGER,
+        primaryKey: true,
+        autoIncrement: true,
+    },
+    tr: {
+        type: DataTypes.STRING(32),
+        allowNull: false,
+        unique: true,
+    },
+}, {
+    schema: 'chat',
+    tableName: 'rights',
+    timestamps: false,
+    underscored: true,
+});
+
+export default ChatRight;

backend/models/chat/room.js

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+import { DataTypes } from 'sequelize';
+import { sequelize } from '../../utils/sequelize.js';
+
+const Room = sequelize.define('Room', {
+    id: {
+        type: DataTypes.INTEGER,
+        primaryKey: true,
+        autoIncrement: true,
+    },
+    title: {
+        type: DataTypes.TEXT,
+        allowNull: false,
+    },
+    ownerId: {
+        type: DataTypes.INTEGER,
+        allowNull: true, // kann null sein, wenn system-owned
+    },
+    roomTypeId: {
+        type: DataTypes.INTEGER,
+        allowNull: true,
+    },
+    isPublic: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: true,
+    },
+    genderRestrictionId: {
+        type: DataTypes.INTEGER,
+        allowNull: true,
+    },
+    password: {
+        type: DataTypes.STRING,
+        allowNull: true,
+    },
+    minAge: {
+        type: DataTypes.INTEGER,
+        allowNull: true,
+    },
+    maxAge: {
+        type: DataTypes.INTEGER,
+        allowNull: true,
+    },
+    passwordHash: {
+        type: DataTypes.TEXT,
+        allowNull: true,
+    },
+    friendsOfOwnerOnly: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: false,
+    },
+    requiredUserRightId: {
+        type: DataTypes.INTEGER,
+        allowNull: true,
+    },
+}, {
+    schema: 'chat',
+    tableName: 'room',
+    timestamps: true,
+    underscored: true,
+    indexes: [
+        {
+            name: 'idx_chat_room_owner',
+            fields: ['owner_id'],
+        },
+    ],
+});
+
+export default Room;

backend/models/chat/room_type.js

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+import { DataTypes } from 'sequelize';
+import { sequelize } from '../../utils/sequelize.js';
+
+const RoomType = sequelize.define('RoomType', {
+    id: {
+        type: DataTypes.INTEGER,
+        primaryKey: true,
+        autoIncrement: true,
+    },
+    tr: {
+        type: DataTypes.STRING(32),
+        allowNull: false,
+        unique: true,
+    },
+}, {
+    schema: 'chat',
+    tableName: 'room_type',
+    timestamps: false,
+    underscored: true,
+});
+
+export default RoomType;

backend/models/chat/user.js

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+import { DataTypes } from 'sequelize';
+import { sequelize } from '../../utils/sequelize.js';
+
+const ChatUser = sequelize.define('ChatUser', {
+    id: {
+        type: DataTypes.INTEGER,
+        primaryKey: true,
+        autoIncrement: true,
+    },
+    falukant_user_id: {
+        type: DataTypes.INTEGER,
+        allowNull: false,
+        comment: 'Verknüpfung zu community.falukant_user',
+    },
+    display_name: {
+        type: DataTypes.STRING(64),
+        allowNull: false,
+    },
+    color: {
+        type: DataTypes.STRING(16), // z.B. Hex-Code
+        allowNull: false,
+        defaultValue: '#000000',
+    },
+    show_gender: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: true,
+    },
+    show_age: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: true,
+    },
+}, {
+    schema: 'chat',
+    tableName: 'user',
+    timestamps: true,
+    underscored: true,
+});
+
+export default ChatUser;

backend/models/chat/user_rights.js

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+import { DataTypes } from 'sequelize';
+import { sequelize } from '../../utils/sequelize.js';
+import ChatUser from './user.js';
+import ChatRight from './rights.js';
+
+const ChatUserRight = sequelize.define('ChatUserRight', {
+    chatUserId: {
+        type: DataTypes.INTEGER,
+        allowNull: false,
+        primaryKey: true,
+        references: null, // Assoziation wird separat gesetzt
+    },
+    chatRightId: {
+        type: DataTypes.INTEGER,
+        allowNull: false,
+        primaryKey: true,
+        references: null, // Assoziation wird separat gesetzt
+    },
+}, {
+    schema: 'chat',
+    tableName: 'user_rights',
+    timestamps: false,
+    underscored: true,
+});
+
+export default ChatUserRight;