fix: Make dependency installation optional in Makefile

[LuisAPI]

Summary
Modified the start-backend target in the Makefile to make dependency
installation optional, improving developer experience by allowing faster
startup when dependencies are already installed.

• Modified start-backend target: Now runs without dependency
  installation by default
  • Added optional dependency installation: Use make start-backend DEPS=true to install dependencies before starting

    • Improved developer workflow: Developers can now start the
      backend immediately if dependencies are already installed

      Usage

      # Start backend without installing dependencies (default)
      make start-backend
      
      # Start backend with dependency installation
      make start-backend DEPS=true

      Benefits

      • Faster development cycles: No need to wait for dependency
        installation on subsequent runs

    • Flexible workflow: Developers can choose when to install
      dependencies

      • Backward compatibility: Original behavior still
        available with DEPS=true parameter

        Testing

        • ✅ make start-backend starts backend without installing
          deps
          • ✅ make start-backend DEPS=true installs deps and
            starts backend
        • ✅ Existing make start command continues to work as
          expected

Summary by Sourcery

Make the Makefile start-backend target skip dependency installation by default and add an optional DEPS flag to install dependencies when needed

Enhancements:

• Remove mandatory dependency installation from start-backend target
• Add DEPS=true option to control when dependencies are installed before starting the backend

[sourcery-ai]

Reviewer's Guide

The PR refactors the Makefile’s start-backend target to drop its mandatory install-deps prerequisite and introduce a DEPS flag for optional dependency installation, allowing faster backend startup when dependencies are already present.

File-Level Changes

Change	Details	Files
Convert start-backend target to use optional dependency installation	Removed the install-deps prerequisite from start-backend Added a DEPS=true conditional block to install dependencies only when requested Updated comments and usage instructions to reflect the new flag	Makefile

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[sourcery-ai]

Hey @LuisAPI - I've reviewed your changes - here's some feedback:

• Consider renaming the DEPS variable to something like INSTALL_DEPS for clearer intent and to avoid possible naming conflicts.
• For readability and maintainability, you might use Makefile’s native conditional syntax (ifeq/endif) instead of embedding a shell if block.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- Consider renaming the `DEPS` variable to something like `INSTALL_DEPS` for clearer intent and to avoid possible naming conflicts.
- For readability and maintainability, you might use Makefile’s native conditional syntax (ifeq/endif) instead of embedding a shell `if` block.

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