Add order processor module

[vishnu-deepsource]

Adds order_processor.py for handling customer orders, discounts, and reporting.

What

• OrderProcessor class: add orders, apply tier discounts, compute totals
• Config loader, amount parser, report runner helpers

Note

Demo module — contains a range of bug-risk and anti-pattern issues for analyzer coverage:

• Mutable default args (orders=[], filters={})
• Weak MD5 hash for identity token
• Bare except
• eval on input + os.system string concat (command injection)
• File handle never closed
• Unhandled dict KeyError in apply_discount
• Inconsistent return in find_order
• range(len(...)) loop, redundant boolean, hardcoded password

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