build(docker): add core application image

.dockerignore

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+.git
+.worktrees
+.superpowers
+.codex
+.agents
+**/.DS_Store
+**/.env
+**/.env.*
+!**/.env.example
+**/.npmrc
+**/.pypirc
+**/.netrc
+**/.ssh
+**/*.key
+**/*.pem
+**/*.p12
+**/*.pfx
+**/.venv
+**/node_modules
+**/__pycache__
+**/.pytest_cache
+**/.ruff_cache
+**/coverage
+**/dist
+backend/data
+harness/workspaces
+harness/sessions
+harness/artifacts
+harness/indexes
+harness/corpus
+deploy