fix(#812): resolve subpath-mounted gitea repo slug

packages/mosaic/framework/tools/git/detect-platform.sh

@@ -85,9 +85,21 @@ gitea_url_matches_host() {
 import sys
 from urllib.parse import urlparse
 
-url, host = sys.argv[1:]
-parsed = urlparse(url)
-raise SystemExit(0 if parsed.scheme in {"http", "https"} and parsed.hostname == host else 1)
+url, remote_host = sys.argv[1:]
+configured = urlparse(url)
+remote = urlparse(f"//{remote_host}")
+if configured.scheme not in {"http", "https"} or configured.hostname != remote.hostname:
+    raise SystemExit(1)
+
+configured_port = configured.port
+remote_port = remote.port
+if remote_port is None:
+    default_port = 80 if configured.scheme == "http" else 443
+    if configured_port not in {None, default_port}:
+        raise SystemExit(1)
+elif configured_port != remote_port:
+    raise SystemExit(1)
+raise SystemExit(0)
 PY
 }
 
@@ -354,6 +366,47 @@ get_gitea_api_host_for_repo_override() {
     get_host_from_url "${GITEA_URL:-}"
 }
 
+# Resolve owner/repo relative to a configured Gitea base URL. HTTP(S) clone
+# URLs can include the deployment prefix (for example /gitea/owner/repo.git),
+# but Gitea's /repos API expects only owner/repo. Root-mounted and SSH clone
+# forms retain their existing owner/repo behavior.
+get_gitea_repo_slug_for_url() {
+    local configured_url="$1" remote_url
+    remote_url=$(git remote get-url origin 2>/dev/null) || return 1
+
+    if [[ "$remote_url" =~ ^https?:// ]]; then
+        python3 - "$remote_url" "$configured_url" <<'PY'
+import sys
+from urllib.parse import urlparse
+
+remote = urlparse(sys.argv[1])
+base = urlparse(sys.argv[2])
+remote_path = remote.path.strip("/")
+if remote_path.endswith(".git"):
+    remote_path = remote_path[:-4]
+base_path = base.path.strip("/")
+remote_parts = [part for part in remote_path.split("/") if part]
+base_parts = [part for part in base_path.split("/") if part]
+
+if base_parts and remote_parts[:len(base_parts)] == base_parts:
+    repo_parts = remote_parts[len(base_parts):]
+elif len(remote_parts) == 2:
+    # Preserve a root-shaped clone URL when provider API configuration carries
+    # a reverse-proxy prefix separately.
+    repo_parts = remote_parts
+else:
+    raise SystemExit(1)
+
+if len(repo_parts) != 2:
+    raise SystemExit(1)
+print("/".join(repo_parts))
+PY
+        return
+    fi
+
+    get_repo_slug
+}
+
 get_gitea_repo_args() {
     local repo host login
     repo=$(get_repo_slug) || return 1
@@ -377,6 +430,11 @@ get_remote_host() {
         echo "${host##*@}"
         return 0
     fi
+    if [[ "$remote_url" =~ ^ssh://([^/]+)/ ]]; then
+        local host="${BASH_REMATCH[1]}"
+        echo "${host##*@}"
+        return 0
+    fi
     if [[ "$remote_url" =~ ^git@([^:]+): ]]; then
         echo "${BASH_REMATCH[1]}"
         return 0