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في هذا الدرس

explain architecture as the set of decisions that are expensive to change.

الموضوعات المخطط لها

• Architecture is structure plus the rules about who may depend on whom.
• Its job is to keep change cheap: swap a database, a payment provider, or a framework without a rewrite.
• Drivers: team size, domain complexity, change rate, and quality needs (latency, availability).
• No style is best; each protects something and costs something.
• Shop's pain today: business rules call JPA directly, so every change touches everything.