feat: Initial project structure for expense tracker

This commit introduces the initial project structure for the expense tracker application. It includes the basic directory layout, configuration files, a FastAPI server with a `/process-expense` endpoint for n8n integration, and a `.gitignore` file to ensure a clean repository. This completes Phase 1 of the development plan.

.env.example

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+# Telegram
+TELEGRAM_BOT_TOKEN=
+
+# OpenAI
+OPENAI_API_KEY=
+
+# Google Cloud
+GOOGLE_APPLICATION_CREDENTIALS=
+SPREADSHEET_ID=
+
+# Environment
+ENV=dev

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak
+venv.bak
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/

config/keywords.csv

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+keyword,categoria_principal,subcategoria,tipo_gasto_default
+monitor,Tecnología,Equipo de Cómputo,negocio
+croquetas,Personal,Mascotas,personal
+hosting,Tecnología,Dominios y Hosting,negocio
+libro,Educación,Libros y Material,negocio

config/providers.csv

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+provider_name,aliases,categoria_principal,subcategoria,tipo_gasto_default
+Amazon,"amazon,amzn,amazon mx",Por Determinar,Compras en Línea,
+Office Depot,"officedepot,office",Administración,Suministros de oficina,negocio
+Uber Eats,"ubereats,uber",Personal,Comida a domicilio,personal
+GoDaddy,"godaddy",Tecnología,Dominios y Hosting,negocio
+Cinepolis,"cinepolis",Personal,Entretenimiento,personal

config/user_config.json

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+{
+  "user_name": "Marco Gallegos",
+  "rfc": "GAMM910513CW6",
+  "regimen_fiscal_default": "612 - Persona Física con Actividad Empresarial y Profesional",
+  "moneda_default": "MXN",
+  "pais": "MX",
+  "timezone": "America/Mexico_City"
+}

requirements.txt

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+fastapi
+python-telegram-bot
+openai
+google-api-python-client
+pydantic
+uvicorn
+python-dotenv

src/main.py

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+from fastapi import FastAPI, Request
+import logging
+
+# Configure logging
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+app = FastAPI()
+
+@app.get("/")
+async def root():
+    return {"message": "Expense Tracker API is running."}
+
+@app.post("/process-expense")
+async def process_expense(request: Request):
+    """
+    Receives expense data from n8n, logs it, and returns a confirmation.
+    """
+    payload = await request.json()
+    logger.info(f"Received expense data: {payload}")
+    return {"status": "received", "data": payload}