feat: initial project structure

- CLAUDE.md project passport
- Agent system prompts (architect, developer, reviewer, tester, deployer)
- Gitea Actions CI pipeline (lint, test, build)
- Docker configuration (Dockerfile, docker-compose.yml)
- Canonical directory structure per BRD
- Makefile with dev/test/lint/build/deploy targets
- Architecture docs skeleton

Refs: multi-agent F0-3, F0-5, F0-6, F0-8

CHANGELOG.md

@@ -0,0 +1,13 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+Format: [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
+
+## [Unreleased]
+
+### Added
+- Initial project structure
+- CLAUDE.md project passport
+- Agent system prompts (architect, developer, reviewer, tester, deployer)
+- CI pipeline (Gitea Actions)
+- Docker configuration