Release pipeline: cargo-release config + Gitea Actions workflows

- release.toml: one shared workspace version, single vX.Y.Z tag,
  full test suite as the pre-release gate, no crates.io publishing.
- .gitea/workflows/ci.yml: the Woodpecker quality bar (fmt, clippy
  -D warnings, tests) for repos served by act_runner.
- .gitea/workflows/release.yml: on a version tag, build stripped
  release binaries for x86_64 and aarch64 Linux, bundle them with the
  systemd units, rendered man pages and example config, and attach the
  tarballs (+ sha256) to a Gitea release via the API.
- dist/PKGBUILD: point at the repo's new home on project.uhhm.no.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -0,0 +1,25 @@
+# Gitea Actions mirror of the Woodpecker quality bar (.ci/woodpecker.yaml):
+# fmt, clippy -D warnings, full test suite.
+name: ci
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  quality:
+    runs-on: ubuntu-latest
+    container: rust:1
+    steps:
+      - uses: actions/checkout@v4
+      - name: rustfmt
+        run: |
+          rustup component add rustfmt
+          cargo fmt --all --check
+      - name: clippy
+        run: |
+          rustup component add clippy
+          cargo clippy --workspace --all-targets -- -D warnings
+      - name: test
+        run: cargo test --workspace