refactor(Application): Convert remaining components to standalone

[hirokiterashima]

Changes

• Convert all remaining components to standalone. These are pages that are used in the site like register, login, edit profile, not the VLE, AT, CM.
• Change how we bootstrap the application by calling bootstrapApplication(AppComponent) in main.ts. Remove AppModule. Before, we were bootstrapping the application in AppModule.
• Clean up related files

Test

• Site pages work as before. Register, login, change password, contact form. VLE/AT/CM are not affected by this PR

[qltysh]

❌ 9 blocking issues (9 total)

Tool	Category	Rule	Count
qlty	Duplication	Found 26 lines of similar code in 8 locations (mass = 101)	9	❌

[qltysh]

Coverage Impact

Unable to calculate total coverage change because base branch coverage was not found.

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[hirokiterashima]

@breity, please test again. I fixed these issues that you found:

• Log in -> curriculum, click on tag filter drop down
• Register accounts -> student or teacher
• Contact Us

They were missing providers. I also took this opportunity to remove the ColorService and move the getContractColor logic into TagComponent because that's the only place it's used.

Hopefully that's it, but let me know if you find more issues.