feat(tools): add repo_create, repo_update, repo_mirror_push (#12, #13, #16)

repo_create: POST /user/repos or /orgs/{org}/repos, is_org flag routes
repo_update: PATCH /repos/{owner}/{repo}, confirm required when private=false
repo_mirror_push: add/list/delete push mirrors, password never returned

internal/tools/repo_update.go

@@ -0,0 +1,76 @@
+package tools
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
+	"gitea.d-ma.be/mathias/gitea-mcp/internal/registry"
+)
+
+type RepoUpdate struct {
+	c *gitea.Client
+	a *allowlist.Allowlist
+}
+
+func NewRepoUpdate(c *gitea.Client, a *allowlist.Allowlist) *RepoUpdate {
+	return &RepoUpdate{c: c, a: a}
+}
+
+func (t *RepoUpdate) Descriptor() registry.ToolDescriptor {
+	return registry.ToolDescriptor{
+		Name:        "repo_update",
+		Description: "Update repository metadata (description, visibility, default branch, website).",
+		InputSchema: json.RawMessage(`{
+			"type":"object",
+			"properties":{
+				"owner":{"type":"string"},
+				"name":{"type":"string"},
+				"description":{"type":"string"},
+				"private":{"type":"boolean"},
+				"website":{"type":"string"},
+				"default_branch":{"type":"string"},
+				"confirm":{"type":"string","description":"Required when setting private=false. Must equal the repo name."}
+			},
+			"required":["owner","name"]
+		}`),
+	}
+}
+
+type repoUpdateArgs struct {
+	Owner         string  `json:"owner"`
+	Name          string  `json:"name"`
+	Description   *string `json:"description"`
+	Private       *bool   `json:"private"`
+	Website       *string `json:"website"`
+	DefaultBranch *string `json:"default_branch"`
+	Confirm       string  `json:"confirm"`
+}
+
+func (t *RepoUpdate) Call(ctx context.Context, raw json.RawMessage) (json.RawMessage, error) {
+	var args repoUpdateArgs
+	if err := parseArgs(raw, &args); err != nil {
+		return nil, err
+	}
+	if err := t.a.Check(args.Owner); err != nil {
+		return nil, err
+	}
+	// Making a repo public is a significant action — require explicit confirmation.
+	if args.Private != nil && !*args.Private {
+		if args.Confirm != args.Name {
+			return nil, fmt.Errorf("setting private=false makes the repo public: set confirm=%q to proceed", args.Name)
+		}
+	}
+	r, err := t.c.UpdateRepo(ctx, args.Owner, args.Name, gitea.UpdateRepoArgs{
+		Description:   args.Description,
+		Private:       args.Private,
+		Website:       args.Website,
+		DefaultBranch: args.DefaultBranch,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return textOK(r)
+}