Replace temperature with fixed creativity levels

[Copilot]

Temperature (0.0-1.0 float) is unintuitive for non-technical users. Replaced with three fixed creativity levels: "aus" (conservative), "normal" (balanced), "hoch" (creative).

Backend

API Models

• Changed temperature: float → creativity: string in AssistantBase, AssistantUpdate, AssistantVersionResponse
• Added creativity: Optional[str] to ChatCompletionRequest (supports both for backward compatibility)

Model Configuration

• Added per-model creativity mappings to ModelInfo:

  creativity_aus_temperature: float | None = None      # default: 0.0
  creativity_normal_temperature: float | None = None   # default: 0.7
  creativity_hoch_temperature: float | None = None     # default: 1.0

• ModelsConfig.get_temperature_for_creativity() converts creativity → temperature at runtime

Database

• Migration 0008: Converts temperature column to creativity column
• Mapping: < 0.4 → "aus", 0.4-0.8 → "normal", ≥ 0.8 → "hoch"

Router

• chat_router.get_temperature_from_request() converts creativity to model-specific temperature before LLM call

Frontend

UI Components

• Replaced temperature range slider with creativity dropdown in:
  • AdvancedSettingsStep.tsx
  • ChatSettingsContent.tsx
• Options: "Aus (konservativ)", "Normal (ausgewogen)", "Hoch (kreativ)"

Type System

• Updated all TypeScript interfaces: temperature: number → creativity: string
• Updated hooks: useAssistantState, useCreateAssistantState

Local Storage Migration

• migration.ts converts legacy temperature values to creativity on first load
• Same mapping thresholds as backend migration

Translations

• Added German/English labels for all three creativity levels
• Updated info text to explain creativity instead of temperature

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Refactor temperature to creativity</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
Temperature is hard to understand from the typical user. Instead use 3 fixed values for creativity

• "aus", "normal", "hoch"
  The backend has then a configuration for each model, how high the actual temperature for this kind of creativity would be (because different model have different recommended creativities)

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Refactor temperature to creativity #641

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