fix(ai): Codex backend request body matches OpenAI Responses schema

After v1.4.9 the OAuth connect went green, but every real insight
call still failed with:

  Codex request failed (400): { "detail": "Input must be a list" }

The `chatgpt.com/backend-api/codex/responses` endpoint speaks the
OpenAI Responses API shape (`ResponsesApiRequest` in
`codex-rs/codex-api/src/common.rs`), where `input` is a list of typed
message items rather than a single string. CodexClient was sending
the older Chat-Completions-style body (`input: <string>`) which the
upstream rejects with the 400 above.

The body now mirrors the canonical shape:

  {
    "model": "gpt-5.3-codex",
    "instructions": "<system prompt>",
    "input": [
      { "type": "message", "role": "user",
        "content": [{ "type": "input_text", "text": "<user prompt>" }] }
    ],
    "tools": [], "tool_choice": "auto",
    "parallel_tool_calls": false, "store": false, "stream": false
  }

The response shape (Output `ResponseItem[]` with `output_text`
content) is unchanged, so `parseResponse` still works without
modification. Both Settings → KI "Verbindung testen" and the insight
generator now complete end-to-end through the ChatGPT subscription.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "healthlog",
-  "version": "1.4.9",
+  "version": "1.4.10",
   "private": true,
   "packageManager": "pnpm@10.31.0",
   "scripts": {