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fix: URL field now auto-populates and shows required asterisk for custom (#14)

* fix: URL field now auto-populates and shows required asterisk for custom

Fixed multiple URL field behavior issues in config flow:

**Bug Fixes:**
1. **URL field now always visible with auto-population**
   - URL field now appears for all server selections
   - Auto-populates with the correct URL based on server selection
   - For preset servers: shows as Optional with auto-populated value
   - For "Custom" server: shows as Required (with asterisk) with empty default

2. **URL field properly marked as required for custom servers**
   - When "Custom" is selected, field shows asterisk (*)
   - Empty URL validation triggers error message
   - Clear indication that the field must be filled

**How It Works Now:**
- **Preset Server Selected (Global, Frankfurt, etc.)**:
  - URL field shows the auto-populated API endpoint
  - Field is Optional (no asterisk)
  - User can see which URL will be used
  - Description: "Auto-populated based on server selection"

- **Custom Server Selected**:
  - URL field is empty
  - Field is Required (shows asterisk *)
  - Validation enforces non-empty value
  - Description: "Auto-populated based on server selection. Only edit if using a custom API server."

**Technical Changes:**
- Schema building logic now conditional based on selected server
- For custom: `vol.Required(CONF_API_URL, default="")`
- For preset: `vol.Optional(CONF_API_URL, default=<server_url>)`
- URL field always present, but requirement level changes dynamically

**Tests:**
- Added test for URL field auto-population
- Added test for URL field validation
- All 231 unit tests passing
- Pre-commit hooks passing

**Note on Limitations:**
Home Assistant's config flow is not reactive - the form only updates on submit, not when dropdown changes. So users will see the updated URL field after submitting the form once, not immediately when selecting a different server.

Co-Authored-By: Clau... (continued)

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