refactor: flatten padelnomics/padelnomics/ → repo root

git mv all tracked files from the nested padelnomics/ workspace
directory to the git repo root. Merged .gitignore files.
No code changes — pure path rename.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,17 @@
+.venv/
+__pycache__/
+*.pyc
+*.pyo
+.git/
+.gitignore
+.env
+.env.*
+*.db
+*.db-shm
+*.db-wal
+data/
+backups/
+.ruff_cache/
+.pytest_cache/
+.vscode/
+.idea/