Einstellungen-Seite: .env-Werte in DB (app_state), keine .env mehr

Neue /einstellungen-Seite (Zahnrad im Header) mit allen bisherigen .env-Werten
(Ollama, E-Mail, CalDAV, REST-API), gespeichert in SQLite (app_state, cfg:-Prefix).
Libs lesen per lib/config.js zur Laufzeit statt beim Start -> Aenderungen
wirken sofort, kein Neustart. Bestehende .env wird beim ersten Start einmalig
migriert.

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

lib/chat.js

@@ -11,14 +11,12 @@
 // replies as text, token by token, so the UI can render progressively.
 
 const promptStore = require('./prompts');
+const config = require('./config');
 
-const OLLAMA_HOST = (process.env.OLLAMA_HOST || 'https://ollama.com').replace(/\/+$/, '');
-const OLLAMA_MODEL = process.env.OLLAMA_MODEL || 'gpt-oss:120b';
-const OLLAMA_TIMEOUT_MS = Number(process.env.OLLAMA_TIMEOUT_MS || 300000);
 const MAX_TOOL_ROUNDS = 4;
 
 function isConfigured() {
-  return Boolean(process.env.OLLAMA_API_KEY);
+  return Boolean(config.ollama().apiKey);
 }
 
 // Stream a single chat completion from Ollama. `messages` = [{role, content}]
@@ -28,8 +26,8 @@ function isConfigured() {
 // fires with each incremental text chunk. Returns { content, toolCalls }.
 // Aborts cleanly via `signal`.
 async function streamChat({ system, messages, tools, onToken, temperature = 0.6, signal }) {
-  const apiKey = process.env.OLLAMA_API_KEY;
-  if (!apiKey) throw new Error('OLLAMA_API_KEY ist nicht gesetzt.');
+  const { host: ollamaHost, model: ollamaModel, apiKey } = config.ollama();
+  if (!apiKey) throw new Error('OLLAMA_API_KEY ist nicht gesetzt (unter „Einstellungen“ konfigurieren).');
 
   const allMessages = [];
   if (system) allMessages.push({ role: 'system', content: system });
@@ -43,7 +41,7 @@ async function streamChat({ system, messages, tools, onToken, temperature = 0.6,
   }
 
   const body = {
-    model: OLLAMA_MODEL,
+    model: ollamaModel,
     stream: true,
     options: { temperature },
     messages: allMessages,
@@ -52,7 +50,7 @@ async function streamChat({ system, messages, tools, onToken, temperature = 0.6,
 
   let res;
   try {
-    res = await fetch(`${OLLAMA_HOST}/api/chat`, {
+    res = await fetch(`${ollamaHost}/api/chat`, {
       method: 'POST',
       headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${apiKey}` },
       body: JSON.stringify(body),
@@ -216,4 +214,8 @@ function buildContextPrompt(ctx) {
   return parts.join('\n\n');
 }
 
-module.exports = { isConfigured, streamChat, runChat, buildContextPrompt, OLLAMA_MODEL, MAX_TOOL_ROUNDS };
+module.exports = {
+  isConfigured, streamChat, runChat, buildContextPrompt, MAX_TOOL_ROUNDS,
+  // Dynamic so an edit on /einstellungen is reflected without a restart.
+  get OLLAMA_MODEL() { return config.ollama().model; },
+};