feat(llm): Live-Parameter top_p + Live/Restart-Kennzeichnung — Plan-Schritt 4

- local_llm_top_p (Default 0.9) durch Config -> runtime_config (RUNTIME_SETTABLE,
  live ohne Neustart) -> local-openai-compatible Payload (top_p).
- Admin-Einstellungen: top_p als Slider (0–1); Hints "wirkt sofort (kein Neustart)"
  für temperature/top_p.
- Doku: top_p + Klarstellung Live-Parameter (temp/top_p/max_tokens) vs.
  Startup-Wert Kontextfenster (OLLAMA_CONTEXT_LENGTH / llama.cpp -c).

Verifiziert: top_p im Payload, Live-Config-Round-Trip (PUT/DELETE). 165 grün.

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

app/web/app.js

@@ -1384,6 +1384,7 @@ const FIELD_META = {
   piper_voice:                     { ui: "combo",   opts: ["de_DE-thorsten-high","en_US-ryan-high","en_US-lessac-high","en_GB-cori-high","es_ES-sharvard-medium","fr_FR-siwis-medium","it_IT-paola-medium","nl_NL-mls-medium","ru_RU-irina-medium","zh_CN-huayan-medium"], test: "tts", testProvider: "piper" },
   local_llm_system_prompt:         { ui: "textarea", test: "llm" },
   local_llm_temperature:           { ui: "range",   min: 0, max: 2, step: 0.1, test: "llm" },
+  local_llm_top_p:                 { ui: "range",   min: 0, max: 1, step: 0.05, test: "llm" },
   local_llm_max_tokens:            { ui: "number",  min: 0, test: "llm" },
   tts_normalize_level:             { ui: "select",  opts: ["auto","full","light","off"], test: "tts" },
   audio_stream_default:            { ui: "select",  opts: ["true","false"],
@@ -1398,7 +1399,7 @@ const FIELD_GROUPS = [
   { label: "Provider & Sprache",        keys: ["default_stt_provider","default_llm_provider","default_tts_provider","default_language"] },
   { label: "OpenRouter-Modelle & Stimmen", keys: ["openrouter_llm_model","openrouter_tts_model","openrouter_tts_voice"] },
   { label: "Piper TTS",                 keys: ["piper_voice"] },
-  { label: "Lokales LLM",              keys: ["local_llm_system_prompt","local_llm_temperature","local_llm_max_tokens"] },
+  { label: "Lokales LLM",              keys: ["local_llm_system_prompt","local_llm_temperature","local_llm_top_p","local_llm_max_tokens"] },
   { label: "TTS-Verarbeitung",         keys: ["tts_normalize_level","audio_stream_default"] },
   { label: "Gedächtnis",               keys: ["memory_extraction_enabled","memory_extraction_every_n_turns"] },
   { label: "Limits",                    keys: ["daily_request_limit"] },