fix: remove duplicate LawGPT URL settings

[saurabhhhcodes]

Description

Removes the two duplicate lawgpt.service.url entries from application.properties.example, preserving the single environment-backed default. This prevents a later hard-coded value from overriding LAWGPT_SERVICE_URL.

Closes #1600

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature: not applicable to this configuration-only fix
• Breaking change: not applicable; the environment-backed setting is preserved
• Documentation update: not required for this configuration-only fix

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• Documentation changes are not applicable to this configuration-only fix
• My changes generate no new warnings
• Tests are not applicable to this configuration-only fix; focused validation is included below
• New and existing validation passes locally

Validation

• git diff --check passed.
• Confirmed exactly one lawgpt.service.url entry remains and retains ${LAWGPT_SERVICE_URL:http://localhost:8001}.
• Maven validate passed with tests skipped because this is configuration-only.

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