test(oracle): add comprehensive Oracle Integration test coverage

[Deyanju23]

Closes #338

Summary

Add a comprehensive test suite for Oracle Integration covering normal execution, authorization, events, rollback behavior, and edge cases.

Changes

• Added tests/test_feature_201.rs
• Registered the new test module in tests/mod.rs
• Added coverage for the happy path
• Added unauthorized access and malicious actor scenarios
• Verified event emission for state transitions
• Verified storage rollback on failed execution
• Added boundary and uninitialized state tests

Why

Oracle Integration is a critical component of the crowdfunding ecosystem. Comprehensive test coverage helps detect regressions, validates authorization, confirms event contracts, and ensures storage consistency during failures.

Testing

Covered:

• Happy path execution
• Unauthorized access attempts
• Event emission with exact arguments
• Storage rollback on failure
• Boundary values
• Uninitialized state
• Overflow-related edge cases (where applicable)

Validation:

cargo test
cargo clippy --workspace --all-targets -- -D warnings
cargo build --target wasm32-unknown-unknown --release

Scope

This PR adds tests only. It does not modify Oracle Integration behavior, authorization rules, storage layout, or contract functionality except for any minimal test-enabling changes if strictly necessary.

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