chore: update rust dependencies

[CharlieLZ]

Closes #44

/claim #44

This migrates the project to the current major dependency stack rather than only applying semver-compatible lockfile bumps.

Changes:

• update Tonic/Prost to 0.14 and switch proto generation to tonic-prost-build
• update Hyper to 1.x, Tower to 0.5, OpenTelemetry to 0.32, Shuttle to 0.57, and related tracing/runtime crates
• adapt the server startup path to Tonic 0.14 serve APIs instead of the old hyper::Server wrapper
• update OTLP tracing initialization to the 0.32 SpanExporter / SdkTracerProvider APIs
• regenerate the GitHub Actions workflow with gh-workflow 0.8
• refresh Cargo.lock to the latest compatible transitive dependency set

This is intentionally broader than the open semver-compatible dependency PRs; those leave major migrations such as Hyper 1.x, Tonic 0.14, OpenTelemetry 0.32, and Shuttle 0.57 out of scope.

Validation:

• cargo update --verbose
• cargo fmt -- --check
• cargo test
• cargo clippy --all-features --workspace -- -D warnings

Demo: this is a backend dependency migration with no UI flow. I added a short terminal-style validation video showing the local verification evidence: https://github.com/CharlieLZ/rust-grpc/releases/download/rust-grpc-44-demo-f2f689b/rust-grpc-44-demo.mp4

[CharlieLZ]

CI is currently action_required, which appears to be the standard fork workflow approval gate. Local validation passed on this branch:

• cargo fmt -- --check
• cargo test
• cargo clippy --all-features --workspace -- -D warnings

[CharlieLZ]

Added the short demo artifact requested by the bounty guidelines to the PR body:

https://github.com/CharlieLZ/rust-grpc/releases/download/rust-grpc-44-demo-f2f689b/rust-grpc-44-demo.mp4

Local validation on the submitted commit remains:

• cargo fmt -- --check
• cargo test
• cargo clippy --all-features --workspace -- -D warnings