fix : made USE_MOCK configurable via VITE_USE_MOCK env var

[tmdeveloper007]

Closes #2062.

Summary of What Has Been Done:
Replaced hardcoded USE_MOCK = true with a configurable flag driven by the VITE_USE_MOCK environment variable.

Changes Made:

• Changed const USE_MOCK = true to const USE_MOCK = import.meta.env.VITE_USE_MOCK === "true"
• Created Frontend/.env.example documenting VITE_USE_MOCK
• Default is false (undefined !== "true"), so production uses real API by default
• Local dev can set VITE_USE_MOCK=true to use mock data

Impact it Made:

• Enables production deployments to use real AI backend
• Removes need for code changes to switch between mock and real APIs
• Follows existing pattern used by other config values in the codebase
• No lint errors introduced

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Reviewing files that changed from the base of the PR and between da8faf2 and a527d09.

📒 Files selected for processing (2)

• Frontend/.env.example
• Frontend/src/services/api.js

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[riteshbonthalakoti]

Superb implementation, @tmdeveloper007! I've successfully resolved all conflicts in your PR and queued it for merging into gssoc.

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