Add issue templates, CI workflows, and decentralization plan

- Add Gitea issue templates for bug reports and feature requests with
  structured YAML forms for version, database backend, and log level
- Add GitHub Actions CI workflow for automated testing on push/PR
- Add GitHub Actions release workflow for building multi-platform
  binaries on tag push with SHA256 checksums
- Add CONTRIBUTING.md with development setup, PR guidelines, and
  commit message format documentation
- Add DECENTRALIZE_NOSTR.md expansion plan outlining WireGuard tunnel,
  GUI installer, system tray, and proxy server architecture
- Update allowed commands in Claude settings
- Bump version to v0.35.5

Files modified:
- .gitea/issue_template/: Bug report, feature request, and config YAML
- .github/workflows/: CI and release automation workflows
- CONTRIBUTING.md: New contributor guide
- docs/plans/DECENTRALIZE_NOSTR.md: Expansion architecture plan
- .claude/settings.local.json: Updated allowed commands
- pkg/version/version: Version bump to v0.35.5

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/ci.yaml

@@ -0,0 +1,53 @@
+name: CI
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Download libsecp256k1
+        run: |
+          wget -q https://git.mleku.dev/mleku/nostr/raw/branch/main/crypto/p8k/libsecp256k1.so -O libsecp256k1.so
+          chmod +x libsecp256k1.so
+
+      - name: Run tests
+        run: |
+          export LD_LIBRARY_PATH="${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$(pwd)"
+          CGO_ENABLED=0 go test ./...
+
+      - name: Build binary
+        run: |
+          CGO_ENABLED=0 go build -o orly .
+          ./orly version
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Check go mod tidy
+        run: |
+          go mod tidy
+          git diff --exit-code go.mod go.sum
+
+      - name: Run go vet
+        run: CGO_ENABLED=0 go vet ./...