Add bot dependencies and environment configuration template

.env.example

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+# ─── Required ────────────────────────────────────────────────
+TELEGRAM_TOKEN=your_telegram_bot_token_here
+GOOGLE_API_KEY=your_google_ai_studio_api_key_here
+OWNER_ID=your_telegram_user_id_here
+
+# ─── Optional ────────────────────────────────────────────────
+# Gemini model to use (default: gemini-2.0-flash)
+AI_MODEL=gemini-2.0-flash

config.py

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+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+TELEGRAM_TOKEN: str = os.getenv("TELEGRAM_TOKEN", "")
+GOOGLE_API_KEY: str = os.getenv("GOOGLE_API_KEY", "")
+OWNER_ID: int = int(os.getenv("OWNER_ID", "0"))
+OWNER_USERNAME: str = os.getenv("OWNER_USERNAME", "").lstrip("@")
+
+DEFAULT_MODEL: str = os.getenv("AI_MODEL", "gemini-2.5-flash-lite")
+IMAGEN_MODEL: str = os.getenv("IMAGEN_MODEL", "imagen-4.0-fast-generate-001")
+DEFAULT_OR_MODEL: str = "openai/gpt-4o-mini"
+
+GOOGLE_AI_BASE_URL = "https://generativelanguage.googleapis.com/v1beta/openai/"
+OPENROUTER_BASE_URL = "https://openrouter.ai/api/v1"
+OPENROUTER_API_KEY: str = os.getenv("OPENROUTER_API_KEY", "")
+
+MAX_TOKENS_DEFAULT: int = 300
+MAX_TOKENS_MIN: int = 50
+MAX_TOKENS_MAX: int = 4000
+MAX_HISTORY_MESSAGES: int = 20  # messages kept in memory
+MAX_API_CONTEXT: int = 10       # messages sent to API (saves input tokens)
+MAX_INPUT_TOKENS: int = 12000   # auto-reset chat history above this estimated input size
+
+IMAGE_DAILY_LIMIT: int = 10
+
+AUTH_FILE = "authorized_users.json"
+SETTINGS_FILE = "settings.json"
+BOT_VERSION = "1.1.0"
+
+DEFAULT_SYSTEM_PROMPT = """You are Puppy (پاپی), a friendly and capable AI assistant on Telegram.
+
+LANGUAGE: Always reply in the same language as the user's message (Persian/Farsi or English).
+
+TOOLS: You have two tools available via the API: search_web (for real-time info: date, news, weather, prices, recent events) and image_search (when user wants to see images). NEVER output raw XML or JSON tool calls in your text — the API handles tool calls automatically.
+
+FORMATTING: Use Telegram markdown — **bold**, *italic*, `code`, ```code blocks```, ~~strikethrough~~, ||spoiler||.
+
+Be concise, warm, helpful, and occasionally playful with light dog references."""

requirements.txt

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+python-telegram-bot>=21.0,<23.0
+openai>=1.68.0
+google-genai>=1.0.0
+ddgs>=0.1.0
+python-dotenv>=1.0.0