fix: make username queries case fixes (#223)

[KavinRaj117]

Resolves #223. Updates usernameSchema to transform usernames to lowercase on input, and changes eq checks to case insensitive ilike queries in the userMetadataRouter.

Tested it locally by checking the case sensitive usernames and updates ( although im not sure it will work a 100 percent tho)

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Project	Deployment	Actions	Updated
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[ZeyadAbbas]

Could you please make these changes:

• Convert the username input to lowercase as the user types, including when Caps Lock is enabled. So the input should only show lowercase.
• On the server, convert the username to lowercase before checking availability and saving it.
• Check for an existing username using eq after normalization like before, rather than ilike.
• Allow letters, numbers, hyphens, underscores, and dots.

This ensures frontend validation cannot be bypassed and usernames are always stored consistently in lowercase.

[KavinRaj117]

Hey @ZeyadAbbas, I've updated the PR to force lowercase input on the frontend as the user types, updated the schema to allow dots, normalized server inputs with .toLowerCase(), and switched the queries back to eq

[justinschwerdtfeger]

@KavinRaj117 Perhaps you forgot to commit, but I do not see these changes