v0.3.0 — rebrand: PXEForge → OpenPXE, Gated → Queued Deployment

Full rename to match the openpxe.com brand. The product now reads as a
polished open-source project rather than a personal-tool nickname:
the anvil/forge metaphor is gone, replaced with the rainbow-horizon
brand mark from the marketing site.

## Naming changes

**PXEForge → OpenPXE** everywhere it's user-visible or developer-
facing:
- All 8 crate package names (`pxeforge-*` → `openpxe-*`).
- The bin crate dir + binary (`crates/pxeforge` → `crates/openpxe`,
  `bin = "openpxe"`).
- Env vars: `PXEFORGE_*` → `OPENPXE_*` (no compat shim — pre-beta).
- Tracing targets: `pxeforge::*` → `openpxe::*`.
- Prometheus metrics: `pxeforge_*` → `openpxe_*` (pre-beta; nobody
  has dashboards on these yet).
- Container image: `gitea.milesward.dev/mward4/openpxe:0.3.0`.
- All in-tree paths: `/var/lib/openpxe/{isos,work,smb}`,
  `/usr/share/openpxe/ipxe`, `/etc/openpxe/...`.
- Unraid template renamed `pxeforge.xml` → `openpxe.xml`.
- README, NEXT_PHASE.md, architecture.md, comments, and the WebUI
  brand string.

**Gated Deployment → Queued Deployment** as the user-facing concept:
- `Settings::TimeoutAction::GatedDeployment` →
  `QueuedDeployment` (with `#[serde(alias = "gated_deployment")]`
  so v0.2.0 settings.json files keep deserializing).
- Rust types: `Gate` → `QueueEntry`, `GateQueue` → `DeploymentQueue`,
  `GateInner` → `QueueEntryInner`.
- File: `crates/core/src/gate.rs` → `crates/core/src/queue.rs`.
- HTTP routes: `/api/gate/*` → `/api/queue/*`. The JSON list key
  flipped from `"gates"` to `"entries"` to match.
- iPXE shortcut: `/boot/_gate.ipxe` → `/boot/_queue.ipxe`. The
  top-level menu's item id is now `queue` instead of `gate`.
- WebUI sidebar tab: "Forge Gate" → "Queue".
- Field on `AppState`: `gates` → `queue`.

## Brand assets

The anvil + forging-sparks logos are dropped:
- `logo.svg` is now a 24×24 medallion filled with the
  `rainbow-horizon` gradient from openpxe.com (sliding hue rotation
  via SMIL on the gradient stops, no JS needed).
- `anvil-forge.svg` renamed to `loader.svg` and rebuilt as a 64×64
  louder version of the same disc — used for page-load transitions
  and the imaging-progress widget. Adds a subtle scale pulse and a
  white inner-glow so it has dimensionality on either theme.

## CSS rename

- `.forge-progress` → `.queue-progress`
- `.forge-progress .anvil` → `.queue-progress .mark`
- `@keyframes forge-sheen` → `queue-sheen`
- `.loader .anvil` → `.loader .mark`
- "Heating the forge…" loader text → "Loading…"

The rest of the layout is untouched. Light/dark theme tokens and the
sidebar/topbar structure carry over from v0.2.0 unchanged — the
brief was "keeping the UI similar."

## Validation

- `cargo build --workspace` — clean.
- `cargo clippy --workspace --all-targets` — no warnings.
- `cargo test --workspace` — **66 tests passing**, same as v0.2.0.
- Local smoke run against the rebuilt release binary verifies:
  - `/boot.ipxe` emits `Queued Deployment` + `item queue` + chains
    `/boot/_queue.ipxe`
  - `/api/queue` returns `{count, entries}`
  - `/metrics` emits `openpxe_queue_count` (renamed)
  - `/assets/logo.svg` and `/assets/loader.svg` serve the new
    rainbow brand SVGs
  - `/api/status` reports version `0.3.0`

## Migration notes for operators on v0.2.0

- Container image path changed: pull
  `gitea.milesward.dev/mward4/openpxe:0.3.0` (not `pxeforge:`).
- Bind mounts: `/var/lib/openpxe/{isos,work,smb}` (not `pxeforge`).
  Move the host path or update the template.
- Env vars: replace `PXEFORGE_*` with `OPENPXE_*`. The Unraid
  template at `deploy/unraid/openpxe.xml` is already updated.
- `settings.json` carries over transparently — the
  `gated_deployment` value is accepted as an alias.
- HTTP API: any external scripts that hit `/api/gate/*` need to
  switch to `/api/queue/*`. The JSON envelope key is `entries`
  instead of `gates`.

crates/iso-store/src/smb.rs

@@ -20,7 +20,7 @@
 //!   - SMB2 minimum (no SMB1 legacy, not needed for WinPE).
 //!   - Bound to 0.0.0.0:445; operator MUST put this on a trusted install
 //!     VLAN — guest SMB is not for the general internet.
-//!   - smbd runs as the same non-root uid as pxeforge (10001).
+//!   - smbd runs as the same non-root uid as openpxe (10001).
 //!   - If `smbd` isn't on PATH (e.g. lightweight container build without
 //!     Samba), we return `SmbState::SmbdMissing` and the UI surfaces the
 //!     gap. No panics, no retries, no silent failure.
@@ -100,7 +100,7 @@ impl SmbManager {
                 conf,
                 "\n[{name}]\n\
                  path = {}\n\
-                 comment = PXEForge Windows install media ({name})\n\
+                 comment = OpenPXE Windows install media ({name})\n\
                  read only = yes\n\
                  guest ok = yes\n\
                  guest only = yes\n\
@@ -152,7 +152,7 @@ impl SmbManager {
                 *g = Some(c);
                 let s = SmbState::Running { pid, shares };
                 *self.state.lock() = s.clone();
-                tracing::info!(target: "pxeforge::smb", pid, shares=?self.state.lock(), "smbd started");
+                tracing::info!(target: "openpxe::smb", pid, shares=?self.state.lock(), "smbd started");
                 s
             }
             Err(e) => {
@@ -248,7 +248,7 @@ pid directory = /tmp
 pub fn extract_windows_iso(iso_path: &Path, smb_dir: &Path, slug: &str) -> std::io::Result<PathBuf> {
     let target = smb_dir.join(slug);
     if target.join("sources").join("boot.wim").is_file() {
-        tracing::debug!(target: "pxeforge::smb", slug, "ISO already extracted, skipping");
+        tracing::debug!(target: "openpxe::smb", slug, "ISO already extracted, skipping");
         return Ok(target);
     }
     std::fs::create_dir_all(&target)?;
@@ -265,7 +265,7 @@ pub fn extract_windows_iso(iso_path: &Path, smb_dir: &Path, slug: &str) -> std::
             .output()?;
         if out.status.success() { return Ok(target); }
         tracing::warn!(
-            target: "pxeforge::smb",
+            target: "openpxe::smb",
             stderr=%String::from_utf8_lossy(&out.stderr),
             "7z extract failed, trying bsdtar"
         );
@@ -315,7 +315,7 @@ mod tests {
     fn start_without_smbd_reports_missing() {
         // Drop smbd from PATH for this test.
         let saved = std::env::var_os("PATH");
-        std::env::set_var("PATH", "/usr/nowhere-pxeforge-test");
+        std::env::set_var("PATH", "/usr/nowhere-openpxe-test");
         let dir = tempdir().unwrap();
         let m = SmbManager::new(dir.path().into());
         let st = m.start();