refactor: restructure monorepo for clean portfolio layout

- Move timesfm-forecast into apps/ directory
- Flatten Udacity portfolio projects from deep URL-encoded paths
  into data-engineering/01-XX numbered directories
- Remove old My-Data-Engineering-Portifolio/ parent directory
- Rewrite root README.md: professional overview with badges,
  project table, and repo structure diagram
- Create data-engineering/README.md with per-project descriptions
- Add README.md for 02-cassandra-modeling (was missing)
- Add README.md for 05-airflow-pipelines (was missing)
- Normalize capstone readme.md -> README.md
- Update .gitignore: add *.cfg, *.env, *.zip, *.sas7bdat,
  Jupyter checkpoints, IDE dirs; remove uv.lock exclusion
- Add dwh.cfg.example and dl.cfg.example credential templates
- Untrack real credential files (dwh.cfg, dl.cfg)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

apps/timesfm-forecast/pyproject.toml

@@ -0,0 +1,40 @@
+
+[project]
+name = "timesfm-forecast"
+version = "0.1.0"
+description = "Streamlit TimesFM forecast app (OOP, multi-key, horizon range, progress, CSV download)."
+readme = "README.md"
+requires-python = ">=3.10"
+authors = [
+  { name = "Gabriel Faria Pereira" }
+]
+license = { text = "MIT" }
+
+# Keep torch unpinned here (see README for CUDA/CPU wheels)
+dependencies = [
+  "streamlit>=1.31",
+  "pandas>=2.0",
+  "numpy>=1.24",
+  "transformers>=4.45.0",
+  "torch",
+    "accelerate>=0.33",
+]
+
+[project.optional-dependencies]
+dev = [
+  "pytest>=7.0",
+  "ruff>=0.4",
+]
+
+[project.scripts]
+timesfm-app = "timesfm_app.cli:main"
+
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+
+[tool.setuptools.packages.find]
+where = ["src"]