feat(release): automate store publishing (fastlane supply + GitLab CI) and F-Droid recipe

- fastlane: Appfile/Fastfile/Gemfile with deploy_play lane (AAB -> Play internal track)
- CI: tag-gated build:android (signed AAB/APK from CI secrets) + deploy:play jobs
- F-Droid: fdroiddata build recipe at docs/fdroid/org.comunes.tane.yml
- Play compliance: Data Safety / content-rating answer sheet (docs/legal/internal)
- docs/release.md: automated tag-triggered flow, dedicated tane-upload keystore
- pubspec: description now mentions the market, not just the inventory

docs/fdroid/org.comunes.tane.yml

@@ -0,0 +1,62 @@
+# F-Droid metadata for Tane (org.comunes.tane).
+#
+# This is the source of truth for the fdroiddata merge request. To submit:
+#   1. Fork https://gitlab.com/fdroid/fdroiddata
+#   2. Copy this file to  metadata/org.comunes.tane.yml
+#   3. Validate locally:   fdroid lint org.comunes.tane
+#                          fdroid build -v -l org.comunes.tane
+#   4. Open the MR.
+#
+# Prerequisites (see docs/release.md):
+#   - The source repo below must be publicly clonable without auth.
+#   - Each release is a signed git tag `v<version>` (UpdateCheckMode: Tags).
+#   - F-Droid builds and signs the APK with ITS OWN key, so the F-Droid build
+#     and the Google Play build have different signatures and cannot cross-update.
+#
+# NOTE: Flutter-on-F-Droid builds are finicky. Pin the Flutter version to the
+# developer toolchain (3.41.9) and re-run `fdroid build` after every bump. This
+# recipe accounts for the monorepo layout (pub workspace root at repo root, app
+# at apps/app_seeds) and the generated code (slang i18n + Drift via build_runner).
+
+Categories:
+  - Science & Education
+License: AGPL-3.0-or-later
+AuthorName: Comunes
+AuthorWebSite: https://comunes.org
+WebSite: https://tane.comunes.org
+SourceCode: https://git.comunes.org/comunes/tane
+IssueTracker: https://git.comunes.org/comunes/tane/issues
+Translation: https://translate.comunes.org/projects/tane
+
+AutoName: Tane
+
+RepoType: git
+Repo: https://git.comunes.org/comunes/tane.git
+
+Builds:
+  - versionName: 0.1.0
+    versionCode: 1
+    commit: v0.1.0
+    subdir: apps/app_seeds
+    sudo:
+      - apt-get update
+      - apt-get install -y git unzip xz-utils
+      # Pin Flutter to the developer toolchain; keep in sync with .gitlab-ci.yml.
+      - git clone --depth 1 -b 3.41.9 https://github.com/flutter/flutter.git /opt/flutter
+      - git config --global --add safe.directory /opt/flutter
+    output: build/app/outputs/flutter-apk/app-release.apk
+    prebuild:
+      - export PATH="/opt/flutter/bin:$PATH"
+      - flutter config --no-analytics
+      - flutter pub get
+      # Generated sources: i18n (slang) then Drift/other codegen (build_runner).
+      - dart run slang
+      - dart run build_runner build --delete-conflicting-outputs
+    build:
+      - export PATH="/opt/flutter/bin:$PATH"
+      - flutter build apk --release
+
+AutoUpdateMode: Version v%v
+UpdateCheckMode: Tags
+CurrentVersion: 0.1.0
+CurrentVersionCode: 1