Honor edgezero.toml config store id for Trusted Server app config

[ChristianPavilonis]

Problem

Trusted Server runtime config loading currently has app-config defaults hardcoded in core. It does not derive the default config store id/key from the [stores.config] declaration in edgezero.toml.

This caused the runtime to look for app_config even when the manifest declares:

[stores.config]
ids = ["trusted_server_config"]
default = "trusted_server_config"

A temporary hotfix changed the hardcoded defaults to trusted_server_config, but that is not the right long-term behavior.

Desired behavior

• Runtime app-config loading should honor the manifest-defined default config id from edgezero.toml.
• ts config push/diff and runtime loading should agree on the same logical config id and blob key semantics.
• Avoid duplicated constants that can drift from the manifest.

Relevant files

• edgezero.toml
• crates/trusted-server-core/src/settings_data.rs
• crates/trusted-server-core/src/config_payload.rs
• crates/trusted-server-cli/src/run.rs

Notes

PR #864 is only a quick deploy unblocker and should be replaced with a proper manifest-driven fix.