AI Assistant "Providers & API keys" stuck on Loading - LlmProfileService timeout

Problem description:

The AI Assistant settings page Settings -> Tools -> AI Assistant -> Providers & API keys remains permanently on "Loading".

The problem occurs immediately after a clean installation, even before any company BYOK/OpenAI-compatible provider is configured.

The issue is reproducible on:

- IntelliJ IDEA 2026.2.4
- AI Assistant 262.11879.100
- Windows 11

No company LLM provider is configured at the time the problem occurs.

Observed behavior:

The page never finishes loading.
Other AI-related functionality appears partially functional.
For example, model selection is available in some AI actions (e.g. Java to Kotlin conversion).

Relevant log entries:

LlmProfileService - updating available llm profiles

After approximately 45 seconds:

LlmProfileService - Cannot get LLM profiles due to timeout

Additional log information:

Loaded bundled LLM profile rules
Loaded cloud rules version v3.3

Successful requests:

https://frameworks.jetbrains.com/llm-rules/version-mapping.json -> 200
https://frameworks.jetbrains.com/llm-rules/v3.3/llmProfileRules.json -> 200
https://frameworks.jetbrains.com/llm-default-agent/v1/config.json -> 200

The timeout occurs after the profile rules have been loaded successfully.

Steps to reproduce:

1. Start IntelliJ IDEA.
2. Open:
  Settings -> Tools -> AI Assistant -> Providers & API keys
3. Observe that the page stays on "Loading".
4. Wait approximately 45 seconds.
5. Observe:
  LlmProfileService - Cannot get LLM profiles due to timeout

Environment:

- IntelliJ IDEA 2026.2.4
- AI Assistant 262.11879.100
- Windows 11
- JDK: 25.0.4.1 (JetBrains Runtime)

Troubleshooting already performed:

- Uninstalled IntelliJ IDEA completely
- Deleted: %APPDATA%\JetBrains\IntelliJIdea2026.2
- Deleted: %LOCALAPPDATA%\JetBrains\IntelliJIdea2026.2
- Deleted Password Safe/KeePass data
- Reinstalled IntelliJ IDEA
- Reinstalled AI Assistant
- Issue remains unchanged