Add HTTP service, MCP adapter, systemd autostart; fix bugs and docs

- chatterbox_cli_v4.py: cooperative stop/interrupt via threading.Event;
  fix force_split_sentence (word boundary instead of mid-word cut);
  fix synthesize_streaming normalization order (split before preprocess)
- tts_service.py: FastAPI service with job queue, model cache, worker thread;
  LAN-accessible on 0.0.0.0:9999; audio_device default None (auto)
- mcp_adapter.py: MCP adapter (stdio + streamable-http) wrapping REST API;
  update docstring and default TTS_URL to port 9999
- requirements.txt: add fastapi, uvicorn, httpx, mcp
- README.md, BEDIENUNGSANLEITUNG.md: document service, MCP, AI integrations
  (Claude, Ollama, Open WebUI, llama.cpp, Home Assistant), systemd autostart
- CLAUDE.md: reflect current architecture (service + adapter now implemented)

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

mcp_adapter.py

@@ -2,7 +2,7 @@
 """
 Chatterbox TTS – MCP-Adapter
 
-Setzt einen laufenden tts_service.py voraus (Standard: http://127.0.0.1:8000).
+Setzt einen laufenden tts_service.py voraus (Standard: http://127.0.0.1:9999).
 
 Start (streamable-http, Port 8001 – für beliebige MCP-Clients):
     python mcp_adapter.py
@@ -10,18 +10,13 @@ Start (streamable-http, Port 8001 – für beliebige MCP-Clients):
 Start (stdio – für Claude Code / Claude Desktop):
     python mcp_adapter.py --stdio
 
-Claude Code Konfiguration (.claude/settings.json):
-    {
-      "mcpServers": {
-        "chatterbox-tts": {
-          "command": "python",
-          "args": ["/home/dschlueter/chatterbox-tts-cli/mcp_adapter.py", "--stdio"]
-        }
-      }
-    }
+Claude Code (bereits konfiguriert via `claude mcp add --scope user`):
+    claude mcp add --scope user chatterbox-tts \
+        /home/dschlueter/miniforge3/envs/chatterbox/bin/python \
+        /home/dschlueter/chatterbox-tts-cli/mcp_adapter.py --stdio
 
 Umgebungsvariable TTS_URL überschreibt die Service-Adresse:
-    TTS_URL=http://192.168.1.10:8000 python mcp_adapter.py --stdio
+    TTS_URL=http://192.168.1.10:9999 python mcp_adapter.py --stdio
 """
 from __future__ import annotations
 
@@ -31,7 +26,7 @@ import os
 import httpx
 from mcp.server.fastmcp import FastMCP
 
-TTS_URL = os.environ.get("TTS_URL", "http://127.0.0.1:8000").rstrip("/")
+TTS_URL = os.environ.get("TTS_URL", "http://127.0.0.1:9999").rstrip("/")
 
 mcp = FastMCP(
     "Chatterbox TTS",