Add dockerized app and infra scaffolding

.gitignore

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+# ==============================================================================
+# PYTHON + NEXT.JS UNIFIED .GITIGNORE
+# ==============================================================================
+
+# ----------------------------------------------------------------------------
+# Python: Byte-compiled & Cache
+# ----------------------------------------------------------------------------
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.cython_debug/
+cython_debug/
+
+# ----------------------------------------------------------------------------
+# Python: Packaging & Distribution
+# ----------------------------------------------------------------------------
+build/
+dist/
+develop-eggs/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# ----------------------------------------------------------------------------
+# Python: Virtual Environments & Dependency Managers
+# ----------------------------------------------------------------------------
+# Virtual environments
+.venv
+venv/
+env/
+ENV/
+env.bak/
+venv.bak/
+.pixi/
+__pypackages__/
+
+# pyenv
+.python-version
+
+# Dependency lock files (usually committed, uncomment if you prefer to ignore)
+# Pipfile.lock
+# poetry.lock
+# uv.lock
+# pdm.lock
+# pixi.lock
+
+# Tool-specific
+.tox/
+.nox/
+.pdm-python
+.pdm-build/
+.poetry.toml
+.pdm.toml
+
+# ----------------------------------------------------------------------------
+# Python: Testing & Coverage
+# ----------------------------------------------------------------------------
+htmlcov/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py.cover
+.hypothesis/
+.pytest_cache/
+cover/
+.ruff_cache/
+
+# ----------------------------------------------------------------------------
+# Python: Development & IDE
+# ----------------------------------------------------------------------------
+# Jupyter / IPython
+.ipynb_checkpoints
+profile_default/
+ipython_config.py
+
+# Type checkers & linters
+.mypy_cache/
+.dmypy.json
+dmypy.json
+.pyre/
+.pytype/
+
+# Project / IDE settings
+.spyderproject
+.spyproject
+.ropeproject
+
+# PyCharm / JetBrains (uncomment to ignore entire folder)
+# .idea/
+
+# VS Code (uncomment to ignore entire folder)
+# .vscode/
+
+# ----------------------------------------------------------------------------
+# Python: Frameworks & Tools
+# ----------------------------------------------------------------------------
+# Django
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask
+instance/
+.webassets-cache
+
+# Scrapy
+.scrapy
+
+# Celery
+celerybeat-schedule
+celerybeat-schedule.*
+celerybeat.pid
+
+# Sphinx / MkDocs / Marimo
+docs/_build/
+/site
+marimo/_static/
+marimo/_lsp/
+__marimo__/
+
+# Streamlit secrets
+.streamlit/secrets.toml
+
+# ----------------------------------------------------------------------------
+# Next.js / Node.js
+# ----------------------------------------------------------------------------
+# Dependencies
+/node_modules
+/.pnp
+.pnp.js
+.pnp.loader.mjs
+
+# Build outputs
+.next/
+out/
+build/
+
+# TypeScript
+*.tsbuildinfo
+next-env.d.ts
+
+# Testing (Jest, etc.)
+/coverage
+
+# Vercel
+.vercel
+
+# ----------------------------------------------------------------------------
+# General / OS / Security
+# ----------------------------------------------------------------------------
+# Environment variables
+.env
+.env*.local
+.envrc
+
+# OS generated files
+.DS_Store
+Thumbs.db
+*.pem
+
+# Logs & debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+*.log
+
+# PyPI config
+.pypirc
+
+# ==============================================================================
+# End of file
+# ==============================================================================