fix: remove standalone bins from Cargo.toml to fix Tauri bundler failure

[CodeGhost21]

Summary

• Remove openhuman-cli and openhuman-core [[bin]] entries from Cargo.toml to prevent Tauri bundler from trying to copy uncompiled binaries
• Add autobins = false to prevent Cargo auto-discovering src/bin/*.rs files
• Remove unnecessary --bin OpenHuman flag from all CI workflows (build, package-and-publish, release)
• In release.yml, inject [[bin]] entries temporarily before standalone build step

Problem

• All CI workflows (Build, Package and Publish, Release) fail during the Tauri bundling step with:
  Failed to copy binary from ".../release/openhuman-cli" ... does not exist
• Tauri's bundler reads ALL [[bin]] entries from Cargo.toml and tries to copy them into the app bundle, regardless of required-features gating
• The --bin OpenHuman cargo flag only compiled the main binary, but the bundler still expected openhuman-cli and openhuman-core to exist

Solution

• Removed the [[bin]] entries for standalone bins from src-tauri/Cargo.toml so Tauri only sees the OpenHuman binary
• Added autobins = false to [package] to prevent Cargo from auto-discovering binaries in src/bin/
• Removed the --bin OpenHuman cargo flag from all workflows (no longer needed with only one bin target)
• In release.yml, the standalone CLI build step injects [[bin]] entries via printf before compiling with --features standalone-bins

Testing

• cargo metadata --no-deps confirms only OpenHuman binary target is visible
• Verified Cargo.toml parses correctly after changes
• CI workflows pass after merge

Impact

• Fixes all three CI workflows: Build, Package and Publish, Release
• No runtime impact — only CI/build pipeline changes
• Source files src/bin/openhuman-core.rs and src/bin/openhuman-cli.rs are preserved

Breaking Changes

• None

Related

• Issue(s): CI build failures on all recent commits/tags
• Follow-up PR(s)/TODOs: None