Feat: Add password reset page

[AmoghParmar]

Summary

Added the ResetPassword.vue page in Launchpad to support the password reset workflow migrated from the Company app.

Key Changes

• Added the ResetPassword.vue page under src/views/.
• Registered the /reset-password route in src/router/index.ts.
• Reads the required query parameters from the password reset link received through email, including userId, username, and maarg.
• Calls the existing password change API:
  POST /rest/s1/admin/users/{userId}/changePassword
  using the unauthenticated API flow to complete the password reset.
• Added client-side password validation and toast notifications for validation, success, and error feedback.
• Supports the password reset flow without requiring the user to log in first.

Related Issue

Closes #196

[claude]

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