Add telegram-archiver microservice (MVP)

telegram-archiver/requirements.txt

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+# FastAPI + CLI
+fastapi==0.109.0
+uvicorn[standard]==0.27.0
+click==8.1.7
+
+# Telegram
+telethon==1.34.0
+
+# Config & Validation
+pydantic==2.5.3
+pydantic-settings==2.1.0
+python-dotenv==1.0.0
+
+# YAML for front-matter
+pyyaml==6.0.1
+
+# Logging & Observability
+opentelemetry-api==1.22.0
+opentelemetry-sdk==1.22.0
+opentelemetry-instrumentation-fastapi==0.43b0
+
+# HTTP client for large file checks
+httpx==0.26.0
+
+# Utils
+aiofiles==23.2.1