Initial commit: event-driven UK payslip ingest service

Extracted from /home/wizard/code monorepo into its own repo so Woodpecker CI
can watch it. Identical content to /home/wizard/code commit e426028.

See README.md for overview, env vars, and Paperless workflow config.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.woodpecker.yml

@@ -0,0 +1,30 @@
+when:
+  event: push
+  path: "payslip-ingest/**"
+
+clone:
+  git:
+    image: woodpeckerci/plugin-git
+    settings:
+      attempts: 5
+      backoff: 10s
+
+steps:
+  - name: build-and-push
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      username: "viktorbarzin"
+      password:
+        from_secret: dockerhub-pat
+      repo:
+        - registry.viktorbarzin.me/payslip-ingest
+      logins:
+        - registry: registry.viktorbarzin.me
+          username: viktorbarzin
+          password:
+            from_secret: registry-password
+      dockerfile: payslip-ingest/Dockerfile
+      context: payslip-ingest
+      auto_tag: true
+      platforms:
+        - linux/amd64