fix(cloudflared): code-server binds to 127.0.0.1 causing tunnel app error 0

Root cause: code-server (and similar web tools) default to binding to
127.0.0.1 (localhost) inside their containers. This makes them unreachable
from the Docker network and from cloudflared, which connects via the
container's Docker network name.

Changes:
- Migration: Update code-server compose_template to include
  --bind-addr 0.0.0.0:8443 command override
- Migration: Update jupyter-notebook compose_template to include
  --ip=0.0.0.0 flag
- Runtime safety net: _ensure_web_bind_address() auto-injects bind
  address for known web tools (code-server, jupyter-notebook) when
  compose doesn't already specify a command
- Diagnostics: _check_app_binding() compares internal vs external
  connectivity to detect 127.0.0.1 binding issues
- Improved readiness check: 30s timeout, checks HTTP status codes,
  logs curl stderr for debugging

Files:
- apps/api/alembic/versions/2026_05_29_fix_web_tool_bind_address.py
- apps/api/src/services/docker.py
- apps/api/src/api/tool_instances.py
- apps/api/tests/integration/test_tool_types_api_extended.py

Quality gates: pytest 42 passed (5 pre-existing unrelated failures)

apps/api/alembic/versions/2026_05_29_fix_web_tool_bind_address.py

@@ -0,0 +1,130 @@
+"""fix web tool bind address to 0.0.0.0
+
+Revision ID: 2026_05_29_fix_web_tool_bind_address
+Revises: 2026_05_29_remove_ssh_keys_mount_from_manifest
+Create Date: 2026-05-29 14:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = "2026_05_29_fix_web_tool_bind_address"
+down_revision: Union[str, None] = "2026_05_29_remove_ssh_keys_mount_from_manifest"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def _fix_code_server_compose(conn) -> None:
+    """Update code-server compose template to bind to 0.0.0.0."""
+    result = conn.execute(
+        sa.text("""
+            SELECT id, compose_template, definition_type
+            FROM tool_types
+            WHERE name = 'code-server'
+        """)
+    ).fetchone()
+
+    if result is None:
+        return
+
+    tool_id, compose_template, definition_type = result
+
+    if definition_type != "compose" or not compose_template:
+        return
+
+    # Add command to bind to 0.0.0.0 if not already present
+    if "command:" in compose_template:
+        # Already has a command override, skip
+        return
+
+    # Insert command line after the image line
+    lines = compose_template.split("\n")
+    new_lines = []
+    image_line_idx = -1
+    for i, line in enumerate(lines):
+        new_lines.append(line)
+        if "image:" in line and image_line_idx == -1:
+            image_line_idx = i
+            # Insert command with proper indentation (same as image line)
+            indent = line[: len(line) - len(line.lstrip())]
+            new_lines.append(f"{indent}command: --bind-addr 0.0.0.0:8443")
+
+    if image_line_idx == -1:
+        # No image line found, can't safely modify
+        return
+
+    updated_compose = "\n".join(new_lines)
+
+    conn.execute(
+        sa.text("""
+            UPDATE tool_types
+            SET compose_template = :compose_template
+            WHERE id = :id
+        """),
+        {"compose_template": updated_compose, "id": tool_id},
+    )
+
+    print(f"Updated code-server tool type ({tool_id}) to bind to 0.0.0.0:8443")
+
+
+def _fix_jupyter_compose(conn) -> None:
+    """Update jupyter-notebook compose template to bind to 0.0.0.0."""
+    result = conn.execute(
+        sa.text("""
+            SELECT id, compose_template, definition_type
+            FROM tool_types
+            WHERE name = 'jupyter-notebook'
+        """)
+    ).fetchone()
+
+    if result is None:
+        return
+
+    tool_id, compose_template, definition_type = result
+
+    if definition_type != "compose" or not compose_template:
+        return
+
+    if "command:" in compose_template:
+        return
+
+    lines = compose_template.split("\n")
+    new_lines = []
+    image_line_idx = -1
+    for i, line in enumerate(lines):
+        new_lines.append(line)
+        if "image:" in line and image_line_idx == -1:
+            image_line_idx = i
+            indent = line[: len(line) - len(line.lstrip())]
+            # Jupyter needs --ip=0.0.0.0 to bind to all interfaces
+            new_lines.append(f'{indent}command: start-notebook.sh --ip=0.0.0.0 --port=8888 --no-browser')
+
+    if image_line_idx == -1:
+        return
+
+    updated_compose = "\n".join(new_lines)
+
+    conn.execute(
+        sa.text("""
+            UPDATE tool_types
+            SET compose_template = :compose_template
+            WHERE id = :id
+        """),
+        {"compose_template": updated_compose, "id": tool_id},
+    )
+
+    print(f"Updated jupyter-notebook tool type ({tool_id}) to bind to 0.0.0.0:8888")
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    _fix_code_server_compose(conn)
+    _fix_jupyter_compose(conn)
+
+
+def downgrade() -> None:
+    # Cannot safely downgrade without knowing the original compose_template
+    pass