Fix WASM Build Error and Implement Data Access Layer

[google-labs-jules]

This PR fixes a build error where .wasm files were being parsed as JavaScript by the Metro bundler, causing a SyntaxError. It updates metro.config.js to correctly handle .wasm files as assets. Additionally, it implements the Data Access Layer (Step 2) with repositories for Workouts, Exercises, Sets, and Analytics using the Repository pattern.

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PR created automatically by Jules for task 14736182564595119881 started by @Devasy23

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