Add teabot daemon implementation

teabot watches Gitea repos and dispatches one-shot Claude Code sessions in
Docker containers to work issues and review PRs, acting as configurable bot
personalities.

Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv

packaging/nfpm.yaml

@@ -0,0 +1,58 @@
+---
+# nfpm config for building the teabot RPM.
+# Rendered through envsubst (see scripts/build-rpm.sh) then fed to `nfpm pkg`.
+
+name: ${PACKAGE_NAME}
+version: ${PACKAGE_VERSION}
+release: ${PACKAGE_RELEASE}
+arch: ${PACKAGE_ARCH}
+platform: ${PACKAGE_PLATFORM}
+section: default
+priority: extra
+description: "${PACKAGE_DESCRIPTION}"
+
+maintainer: ${PACKAGE_MAINTAINER}
+homepage: ${PACKAGE_HOMEPAGE}
+license: ${PACKAGE_LICENSE}
+
+disable_globbing: false
+
+replaces:
+  - teabot
+provides:
+  - teabot
+
+contents:
+  # The daemon binary.
+  - src: dist/teabot
+    dst: /usr/bin/teabot
+    file_info:
+      mode: 0755
+      owner: root
+      group: root
+
+  # systemd user unit (enable with: systemctl --user enable --now teabot).
+  - src: systemd/teabot.service
+    dst: /usr/lib/systemd/user/teabot.service
+    file_info:
+      mode: 0644
+
+  # Example config, installed as documentation.
+  - src: config.example.yaml
+    dst: /usr/share/doc/teabot/config.example.yaml
+    file_info:
+      mode: 0644
+
+  # Shell completions (generated by scripts/build-rpm.sh before packaging).
+  - src: dist/completions/teabot.bash
+    dst: /usr/share/bash-completion/completions/teabot
+    file_info:
+      mode: 0644
+  - src: dist/completions/_teabot
+    dst: /usr/share/zsh/site-functions/_teabot
+    file_info:
+      mode: 0644
+  - src: dist/completions/teabot.fish
+    dst: /usr/share/fish/vendor_completions.d/teabot.fish
+    file_info:
+      mode: 0644