fix: stabilize ai reply delivery across self-triggered chats

build: fix Dockerfile WORKDIR paths for proto compilation and update Rust image to slim-bookworm

build: add ai-agent to docker-compose and update env config

feat: implement ai-agent Python service with Gemini API

feat: add reply gRPC server and @mention AI trigger to tg-receiver

feat: add AiService and ReceiverService to proto definitions

feat: polish bot UI with HTML formatting, menu and clickable user links

fix: use raw_sql for multi-statement migrations and remap PG to port 5434

build: add tg-bot Dockerfile and docker-compose service

feat: implement bot commands for contacts, chats, search and status

feat: add tg-store gRPC client adapter for bot commands

feat: scaffold tg-bot service with Teloxide and gRPC client

build: connect tg-receiver to tg-store in docker-compose

feat: switch tg-receiver to gRPC sink with file fallback

feat: implement gRPC message sink for tg-store integration