Phase 3 of #273. Container plumbing for the bundled frontend dist:
- flake.nix overlay: `pkgs.hyperhive-frontend` exposed for the
agent / manager containers (mirrors the existing `pkgs.hyperhive`
pattern); module argument `hyperhiveFrontend = system: self
.packages.${system}.frontend` threads the package into the host
hive-c0re module without forcing operators to apply the overlay
on their host pkgs.
- `services.hive-c0re.frontend` option: pinned to the flake's
frontend package by default, overridable for custom dashboard
SPAs. The hive-c0re systemd service gets `HIVE_STATIC_DIR =
${cfg.frontend}/dashboard` — the Rust binary will pick it up
in Phase 4.
- `hyperhive.frontend.dist` option: per-container, defaults to
`pkgs.hyperhive-frontend`. Override to ship a fully custom
agent SPA (advanced; the default + extraFiles flow handles the
common 'add files' case).
- `hyperhive.frontend.extraFiles` option: attrsOf submodule
(mirroring the `hyperhive.extraMcpServers` shape per damocles'
request so existing #322-style assertions keep their grip).
Each entry has `source` (path relative to agent.nix) and
`target` (URL/disk prefix within the merged static tree,
defaulting to the attribute name). Operator-named example:
the bitburner agent drops `bitburner-dist` into
`/bitburner/` alongside the default agent UI at `/`.
- `hyperhive.frontend.mergedDist` (readOnly): the runCommand
derivation that composes `agent/` from the default dist plus
every `extraFiles` entry. Aborts on overwrite so a filename
collision becomes a build error rather than a silent dist swap.
agent-base.nix + manager.nix set their respective systemd
service `HIVE_STATIC_DIR` to this merged path.
Until Phase 4 lands, the env var is set but unused — the Rust
binaries still serve assets via `include_str!`. The cutover
happens in the next commit on this branch.
Refs #273.
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