Add missing tool parameters from Gitea SDK

Expose additional parameters that the Gitea SDK supports but were not
yet wired through the MCP tool definitions:

- list_issues: labels, since, before filters
- issue_write: labels and deadline on create, deadline/remove_deadline on update
- pull_request_write: labels/deadline on create/update, remove_deadline on update,
  force_merge/merge_when_checks_succeed/head_commit_id on merge
- list_branches: page/perPage pagination
- create_repo: trust_model, object_format_name
- label_write: is_archived on create/edit

Also adds params.GetOptionalTime helper for RFC3339 timestamp parsing
and tests for the most important new parameters.

Co-Authored-By: Claude (claude-opus-4-6) <noreply@anthropic.com>

operation/issue/issue_test.go

@@ -0,0 +1,167 @@
+package issue
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+
+	"gitea.com/gitea/gitea-mcp/pkg/flag"
+	"github.com/mark3labs/mcp-go/mcp"
+)
+
+func Test_listRepoIssuesFn_filters(t *testing.T) {
+	const (
+		owner = "octo"
+		repo  = "demo"
+	)
+
+	var (
+		mu       sync.Mutex
+		gotQuery string
+	)
+
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch {
+		case r.URL.Path == "/api/v1/version":
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"version":"1.12.0"}`))
+		case r.URL.Path == fmt.Sprintf("/api/v1/repos/%s/%s", owner, repo):
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"private":false}`))
+		case r.URL.Path == fmt.Sprintf("/api/v1/repos/%s/%s/issues", owner, repo):
+			mu.Lock()
+			gotQuery = r.URL.RawQuery
+			mu.Unlock()
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`[]`))
+		default:
+			http.NotFound(w, r)
+		}
+	})
+
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	origHost := flag.Host
+	origToken := flag.Token
+	origVersion := flag.Version
+	flag.Host = server.URL
+	flag.Token = ""
+	flag.Version = "test"
+	defer func() {
+		flag.Host = origHost
+		flag.Token = origToken
+		flag.Version = origVersion
+	}()
+
+	req := mcp.CallToolRequest{
+		Params: mcp.CallToolParams{
+			Arguments: map[string]any{
+				"owner":  owner,
+				"repo":   repo,
+				"labels": []any{"bug", "enhancement"},
+				"since":  "2026-01-01T00:00:00Z",
+			},
+		},
+	}
+
+	_, err := listRepoIssuesFn(context.Background(), req)
+	if err != nil {
+		t.Fatalf("listRepoIssuesFn() error = %v", err)
+	}
+
+	mu.Lock()
+	defer mu.Unlock()
+
+	if !strings.Contains(gotQuery, "labels=bug%2Cenhancement") {
+		t.Fatalf("expected labels query param, got %s", gotQuery)
+	}
+	if !strings.Contains(gotQuery, "since=2026-01-01") {
+		t.Fatalf("expected since query param, got %s", gotQuery)
+	}
+}
+
+func Test_createIssueFn_labels(t *testing.T) {
+	const (
+		owner = "octo"
+		repo  = "demo"
+	)
+
+	var (
+		mu      sync.Mutex
+		gotBody map[string]any
+	)
+
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/api/v1/version":
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"version":"1.12.0"}`))
+		case fmt.Sprintf("/api/v1/repos/%s/%s", owner, repo):
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"private":false}`))
+		case fmt.Sprintf("/api/v1/repos/%s/%s/issues", owner, repo):
+			mu.Lock()
+			var body map[string]any
+			_ = json.NewDecoder(r.Body).Decode(&body)
+			gotBody = body
+			mu.Unlock()
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"number":1,"title":"test","state":"open"}`))
+		default:
+			http.NotFound(w, r)
+		}
+	})
+
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	origHost := flag.Host
+	origToken := flag.Token
+	origVersion := flag.Version
+	flag.Host = server.URL
+	flag.Token = ""
+	flag.Version = "test"
+	defer func() {
+		flag.Host = origHost
+		flag.Token = origToken
+		flag.Version = origVersion
+	}()
+
+	req := mcp.CallToolRequest{
+		Params: mcp.CallToolParams{
+			Arguments: map[string]any{
+				"owner":    owner,
+				"repo":     repo,
+				"title":    "test issue",
+				"body":     "body",
+				"labels":   []any{float64(10), float64(20)},
+				"deadline": "2026-06-01T00:00:00Z",
+			},
+		},
+	}
+
+	_, err := createIssueFn(context.Background(), req)
+	if err != nil {
+		t.Fatalf("createIssueFn() error = %v", err)
+	}
+
+	mu.Lock()
+	defer mu.Unlock()
+
+	labels, ok := gotBody["labels"].([]any)
+	if !ok || len(labels) != 2 {
+		t.Fatalf("expected 2 labels, got %v", gotBody["labels"])
+	}
+	if labels[0] != float64(10) || labels[1] != float64(20) {
+		t.Fatalf("expected labels [10,20], got %v", labels)
+	}
+	if gotBody["due_date"] == nil {
+		t.Fatalf("expected due_date to be set")
+	}
+}