fix(images): cache Telegram photos by unique_id and pass base64 to LLM commands

Stop reading image files inside gemini/mistral commands; use pre-encoded image data from message parts

Rework loadImagesIfExists / loadImagesFromFileIds to return cached file_unique_ids and download only missing sizes

Encode cached images to base64 when assembling the reply chain

Make getPhotoMaxSize synchronous (returns PhotoSize), and map to URL only when needed

Await MessageStore.put / UserStore.put and prefetch single-image downloads on message receipt

src/commands/gemini-chat.ts

@@ -13,7 +13,6 @@ import {
     oldReplyToMessage,
     startIntervalEditor
 } from "../util/utils";
-import fs from "node:fs";
 
 export class GeminiChat extends ChatCommand {
     command = "gemini";
@@ -66,10 +65,9 @@ export class GeminiChat extends ChatCommand {
             const images = messageParts[0].images;
 
             images.forEach(image => {
-                const base64Image = Buffer.from(fs.readFileSync(image)).toString("base64");
                 input.push({
                     type: "image",
-                    data: base64Image,
+                    data: image,
                     mime_type: "image/png"
                 });
             });

src/commands/mistral-chat.ts

@@ -7,13 +7,11 @@ import {
     escapeMarkdownV2Text,
     logError,
     oldReplyToMessage,
-    photoPathByUniqueId,
     startIntervalEditor
 } from "../util/utils";
 import {Environment} from "../common/environment";
 import {bot, mistralAi} from "../index";
 import {MessageStore} from "../common/message-store";
-import fs from "node:fs";
 
 export class MistralChat extends ChatCommand {
     command = "mistral";
@@ -46,10 +44,9 @@ export class MistralChat extends ChatCommand {
             });
 
             for (const image of part.images) {
-                const base64Image = Buffer.from(fs.readFileSync(photoPathByUniqueId(image))).toString("base64");
                 content.push({
                     type: "image_url",
-                    imageUrl: "data:image/jpeg;base64," + base64Image
+                    imageUrl: "data:image/jpeg;base64," + image
                 });
             }