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

.env.example

@@ -0,0 +1,5 @@
+DATABASE_URL=sqlite:///./data/enduro.db
+HOST=0.0.0.0
+PORT=5556
+TILES_DIR=./data/terrain
+OSRM_URL=http://localhost:5000