feat: initial scaffold with /healthz

Go module gitea.d-ma.be/mathias/gitea-mcp, minimal HTTP server with a
/healthz probe, Taskfile build targets, and .gitignore/README updates.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Taskfile.yml

@@ -0,0 +1,16 @@
+version: '3'
+
+tasks:
+  build:
+    desc: Build the binary
+    cmds: [go build -o bin/gitea-mcp ./cmd/gitea-mcp]
+  run:
+    desc: Run the binary
+    deps: [build]
+    cmds: [./bin/gitea-mcp]
+  test:
+    desc: Run all tests
+    cmds: [go test ./... -race -count=1]
+  lint:
+    desc: Run golangci-lint
+    cmds: [golangci-lint run ./...]