Initial scaffold: API service, K8s operator, and CRDs

Forgebot is a K8s operator + API service for dispatching AI agent
jobs from git forge commands. Includes:

- CRDs: AgentPool, AgentTask, ProviderQueue, RepositoryBinding
- API server with webhook handler, task queue, and comment proxy
- Operator controllers for task scheduling and job management
- Gitea provider with webhook parsing and signature verification
- PostgreSQL database with auto-migration
- Woodpecker CI pipelines and multi-stage Dockerfiles

Makefile

@@ -0,0 +1,53 @@
+.PHONY: build test lint fmt generate docker-api docker-operator clean tidy
+
+BINARY_API := bin/forgebot-api
+BINARY_OP  := bin/forgebot-operator
+VERSION    ?= $(shell git describe --tags --always --dirty 2>/dev/null || echo "0.0.0-dev")
+
+build: tidy
+	go build -ldflags="-s -w" -o $(BINARY_API) ./cmd/api
+	go build -ldflags="-s -w" -o $(BINARY_OP) ./cmd/operator
+
+test:
+	go test -race -count=1 ./pkg/... ./internal/... ./api/...
+
+lint:
+	go vet ./...
+
+fmt:
+	gofmt -w .
+
+generate:
+	controller-gen object paths="./api/..."
+	controller-gen crd paths="./api/..." output:crd:artifacts:config=config/crd/bases
+	controller-gen rbac:roleName=forgebot-operator paths="./internal/controller/..." output:rbac:dir=config/rbac
+
+docker-api:
+	docker build -t forgebot-api:$(VERSION) -f Dockerfile.api .
+
+docker-operator:
+	docker build -t forgebot-operator:$(VERSION) -f Dockerfile.operator .
+
+clean:
+	rm -rf bin/
+
+tidy:
+	go mod tidy
+
+_LATEST := $(shell git tag --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$$' | head -1)
+_BASE   := $(if $(_LATEST),$(_LATEST),v0.0.0)
+_MAJ    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f1)
+_MIN    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f2)
+_PAT    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f3)
+
+patch:
+	@NEW=v$(_MAJ).$(_MIN).$(shell expr $(_PAT) + 1); \
+	git tag $$NEW && echo "Tagged $$NEW" && git push origin $$NEW
+
+minor:
+	@NEW=v$(_MAJ).$(shell expr $(_MIN) + 1).0; \
+	git tag $$NEW && echo "Tagged $$NEW" && git push origin $$NEW
+
+major:
+	@NEW=v$(shell expr $(_MAJ) + 1).0.0; \
+	git tag $$NEW && echo "Tagged $$NEW" && git push origin $$NEW