API key added to CLI tool and PKG

[FayKn]

No description provided.

[Copilot]

Pull request overview

This PR introduces API-key-based authentication (backed by an optional PostgreSQL database) for the PKG signing-key endpoint and adds corresponding CLI support, alongside a few related robustness and compatibility tweaks.

Changes:

• Add optional Postgres connection/pool wiring and API-key guard routing for /v2/.../sign/key in the PKG server.
• Add API-key support to pg-cli enc for retrieving signing keys without interactive auth; improve CLI JSON parsing error handling.
• Update a few supporting pieces (sqlx/tokio deps, dev docker-compose + seed SQL, aes-gcm nonce API adjustments, unix-only file mode setting).

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
pg-pkg/src/server.rs	Adds optional DB pool setup + API-key guarded route for /sign/key.
pg-pkg/src/opts.rs	Adds database_url CLI/env option; updates default IRMA URL.
pg-pkg/src/middleware/irma.rs	Adds IrmaAuthType::Key that validates API keys via Postgres.
pg-pkg/src/handlers/start.rs	Removes an unused import.
pg-pkg/src/generate.rs	Makes unix-only permission setting conditional for portability.
pg-pkg/docker-compose.dev.yml	Adds a dev Postgres/Adminer compose setup for local API-key testing.
pg-pkg/api_keys.sql	Adds schema + seed data for api_keys table.
pg-pkg/Cargo.toml	Adds sqlx/tokio deps and enables clap env parsing.
pg-core/src/client/rust/mod.rs	Updates AES-GCM nonce usage to match API expectations.
pg-cli/src/opts.rs	Adds --api-key option for encryption flow.
pg-cli/src/encrypt.rs	Uses API-key flow for signing key retrieval; improves identity JSON parse errors.
pg-cli/src/client.rs	Fixes Client::new return type signature; removes unused struct.
Cargo.lock	Dependency lockfile updates for new crates/features.

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[Copilot]

@FayKn I've opened a new pull request, #44, to work on those changes. Once the pull request is ready, I'll request review from you.