fix(ci): resolve Docker Integration Tests - Cargo.toml library path issue

[v1truv1us]

Problem

Docker Integration Tests are failing with:

error: failed to parse manifest at `/app/Cargo.toml`
  can't find library `src_tauri_lib`, rename file to `src/lib.rs` or specify lib.path

Root Cause

The Cargo.toml library configuration is not correctly set up for Docker builds.

Solution

1. Verify src-tauri/Cargo.toml library path configuration
2. Ensure library name matches actual file structure
3. Test Docker build with corrected configuration

Priority

MEDIUM - Pre-existing infrastructure issue (not blocking PR #36)

Related

• PR fix(ci): resolve integration test workflow failures #36: fix(ci): resolve integration test workflow failures (MERGED)