docs: add deployment guide for Robrix + Palpo + Octos

[TigerInYourDream]

Summary

Add a one-stop deployment guide that walks users through setting up the complete Robrix + Palpo + Octos AI chat system.

• Bilingual: English (docs/deployment-guide.md) + Chinese (docs/deployment-guide-zh.md)
• Self-contained: all configs inline with field-level explanations, no need to jump to external docs
• Ready-to-run: example configs in docs/examples/ — user only needs to set one API key
• Tested end-to-end: Quick Start verified on macOS (ARM64) with Docker, Robrix registration → bot chat works

What's included

File	Purpose
docs/deployment-guide.md	English deployment guide (7 sections)
docs/deployment-guide-zh.md	Chinese deployment guide
docs/examples/compose.yml	Docker Compose (Palpo + PostgreSQL + Octos, built from source)
docs/examples/palpo.toml	Palpo homeserver config
docs/examples/appservices/octos-registration.yaml	Appservice registration
docs/examples/config/botfather.json	Octos bot profile
docs/examples/config/octos.json	Octos global config
docs/examples/setup.sh	One-time setup script (clones repos, creates .env)
docs/examples/.env.example	Environment variables template
docs/images/register-account.png	Registration screenshot
README.md	Added TIP box linking to the deployment guide

Key design decisions

• Build from source in Docker (not pre-built images) — supports all architectures (x86_64, ARM64/Apple Silicon)
• server_name = "127.0.0.1:8128" — works with matrix-rust-sdk's server_name_or_homeserver_url() discovery
• created_at/updated_at in botfather.json — required by Octos profile loader (missing = bot silently skipped)
• No federation content — that's Palpo's advanced topic, kept out of scope

Test plan

• Clean environment: rm -rf data/ → ./setup.sh → docker compose up -d → all 3 services healthy
• Robrix registration against http://127.0.0.1:8128 succeeds
• Bot responds to messages (curl verified: register → create room → invite bot → send message → receive AI reply)
• Verify docs render correctly on GitHub (images, tables, code blocks)
• Verify Chinese version renders correctly