feat: seven-send 0.1.0 — Library + CLI für SMS und TTS-Anrufe via seven.io

Wiederverwendbarer Baustein (eigenes Paket), nutzbar in beliebigen Programmen,
Cron-Jobs und Alerts:

- client.py: synchroner SevenClient.send_sms / send_voice (Voice als SSML,
  XML-escaped); Result mit ok/code/price/error, best-effort Fehlerbehandlung,
  dry_run-Modus
- cli.py: `seven-send sms|voice` mit --dry-run, --json, sauberen Exit-Codes;
  API-Key aus --api-key oder $SEVEN_API_KEY
- src-Layout, pyproject (console_script seven-send), MIT-Lizenz
- 12 Tests (Client + CLI), httpx gemockt

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pyproject.toml

@@ -0,0 +1,26 @@
+[build-system]
+requires = ["setuptools>=61"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "seven-send"
+version = "0.1.0"
+description = "Kleine Library + CLI zum Verschicken von SMS und TTS-Sprachanrufen über seven.io"
+readme = "README.md"
+requires-python = ">=3.10"
+license = { text = "MIT" }
+authors = [{ name = "Dieter Schlüter", email = "dieter.schlueter@linix.de" }]
+keywords = ["seven.io", "sms", "voice", "tts", "cli", "notification"]
+dependencies = ["httpx>=0.27"]
+
+[project.optional-dependencies]
+dev = ["pytest>=8"]
+
+[project.scripts]
+seven-send = "seven_send.cli:main"
+
+[project.urls]
+Homepage = "https://kitux.de/forgejo/dschlueter/seven_send"
+
+[tool.setuptools.packages.find]
+where = ["src"]