refactor(bot): centralize runtime state; support albums + safer vision handling

- make MessageStore.put() return StoredMessage and allow collectReplyChainText() to work with StoredMessage
- move muted users + answers loading into Environment (add Answers model + GEMINI_IMAGE_MODEL)
- extract message handling into processNewMessage() and add media-group (album) caching/downloading by unique_file_id
- for Ollama: check model capabilities before sending images; use replyToMessage helper consistently
- add /geminiGenImage command stub for Gemini image generation

src/commands/prefix-response.ts

@@ -1,10 +1,10 @@
 import {ChatCommand} from "../base/chat-command";
 import {Message} from "typescript-telegram-bot-api";
-import {logError, randomValue, oldReplyToMessage} from "../util/utils";
-import {prefixAnswers} from "../db/database";
+import {logError, randomValue, replyToMessage} from "../util/utils";
+import {Environment} from "../common/environment";
 
 export class PrefixResponse extends ChatCommand {
     async execute(msg: Message): Promise<void> {
-        await oldReplyToMessage(msg, randomValue(prefixAnswers)).catch(logError);
+        await replyToMessage({message: msg, text: randomValue(Environment.ANSWERS.prefix)}).catch(logError);
     }
 }