Fix/issue 2362 remove create all

[Prateek2007-cmd]

Description

Resolves Issue #2362 (Direct Schema Creation Over Migrations).

The backend application was previously reliant on models.Base.metadata.create_all() upon application startup. This initialization method is strictly intended for rapid prototyping and local development; it lacks any mechanism for version control, rollback capabilities, or schema evolution (e.g., executing ALTER TABLE). Deploying this to production is a severe liability that invariably leads to data corruption or data loss during deployment upgrades.

This PR permanently eradicates the create_all invocation from the application lifecycle to force compliance with a robust migration pipeline.

Changes Made

• Technical Debt Purged: Removed create_all from backend/app/main.py.
• Architectural Shift: Application startup is now completely decoupled from database schema modification. The repository now mandates the use of an external, stateful migration tool like Alembic to track and execute schema changes deterministically.

Type of Change

• Architectural Hardening
• Technical Debt Resolution

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