Add HTTP API server, Android app, and CI build/publish pipeline

- docker-compose.yml + tooling-container/src/server.py: serve
  preprocess/OCR/extract over an async job API (POST /jobs, GET
  /jobs/{id}) instead of manual host-script runs per receipt
- android/: Kotlin/Compose app - capture a receipt photo, poll job
  progress, review/edit extracted fields, save locally (Room), export
  to CSV/ODS
- .gitea/workflows/build.yml: build the debug APK and publish it to
  dl.ladkau.de on push
- build-image.sh: also pull ollama/ollama so all pipeline images are
  ready after one script
- add project logo (also used for the app's launcher icon/splash)

docker-compose.yml

@@ -0,0 +1,35 @@
+# Runs the pipeline as a long-lived HTTP API for the Android app, on top
+# of the same tooling-container image the numbered host scripts use.
+# `docker compose up` alone is enough: the api service waits for Ollama
+# and pulls the model itself (see tooling-container/src/server.py).
+#
+# The numbered host scripts (0_run_ollama.sh, 1/2/3_*.sh) and
+# test_batch.sh are untouched and remain the way to inspect/test the
+# pipeline stage by stage; this is the additive "serve it for real" path.
+#
+# Usage: docker compose up -d
+# API reachable at http://<this-host>:8080 from any device on the LAN.
+services:
+  ollama:
+    image: ollama/ollama
+    volumes:
+      - fuelish-ollama-data:/root/.ollama
+    restart: unless-stopped
+
+  api:
+    build:
+      context: ./tooling-container
+    restart: unless-stopped
+    depends_on:
+      - ollama
+    environment:
+      OLLAMA_URL: http://ollama:11434/api/chat
+      OLLAMA_BASE_URL: http://ollama:11434
+      OLLAMA_MODEL: qwen2.5:3b
+    command: ["uvicorn", "server:app", "--app-dir", "/opt/app/src", "--host", "0.0.0.0", "--port", "8000"]
+    ports:
+      - "8080:8000"
+
+volumes:
+  fuelish-ollama-data:
+    name: fuelish-ollama-data