Add LLM improvements

[RichDom2185]

Description

• Move summary notes to BE to prevent bypassing prompt
• Update request format

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

Checklist

• I have tested this code
• I have updated the documentation

[coveralls]

Pull Request Test Coverage Report for Build 10337779335

Details

• 4 of 35 (11.43%) changed or added relevant lines in 3 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 31.216%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/features/sicp/chatCompletion/sicpNotes.ts	0	1	0.0%
src/features/sicp/chatCompletion/api.ts	0	9	0.0%
src/pages/sicp/subcomponents/chatbot/ChatBox.tsx	4	25	16.0%

Files with Coverage Reduction	New Missed Lines	%
src/pages/sicp/subcomponents/chatbot/ChatBox.tsx	1	7.46%
src/features/sicp/chatCompletion/chatCompletion.ts	3	0.0%

Totals
Change from base Build 10266162392:	-0.2%
Covered Lines:	4819
Relevant Lines:	14583

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💛 - Coveralls

[yiwen101]

LGTM

[RichDom2185]

Corresponding BE PR: source-academy/backend#1144