fix(cloudflared): use --host 0.0.0.0 instead of --bind-addr for code-server

The --bind-addr flag caused code-server to fail entirely (app not
responding on any interface). The correct override for the
coder/code-server image is --host 0.0.0.0, which overrides the
entrypoint's --host 127.0.0.1.

Changes:
- Migration: Replace --bind-addr with --host 0.0.0.0, also handle
  existing broken templates by detecting --bind-addr and replacing it
- Runtime safety net: _ensure_web_bind_address uses --host 0.0.0.0
- Test fixture: Updated compose template to match

Quality gates: pytest 42 passed

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

@@ -5,6 +5,7 @@ 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
@@ -35,25 +36,32 @@ def _fix_code_server_compose(conn) -> None:
     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
+    # Fix or add command to bind to 0.0.0.0
     lines = compose_template.split("\n")
     new_lines = []
     image_line_idx = -1
+    command_fixed = False
     for i, line in enumerate(lines):
+        # Replace broken --bind-addr with correct --host
+        if "command:" in line and "--bind-addr" in line:
+            indent = line[: len(line) - len(line.lstrip())]
+            new_lines.append(f"{indent}command: --host 0.0.0.0")
+            command_fixed = True
+            continue
         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
+    # If no command line exists, insert one after image
+    if not command_fixed and image_line_idx != -1:
+        image_line = lines[image_line_idx]
+        indent = image_line[: len(image_line) - len(image_line.lstrip())]
+        # Insert after the image line in new_lines
+        insert_idx = new_lines.index(image_line) + 1
+        new_lines.insert(insert_idx, f"{indent}command: --host 0.0.0.0")
+        command_fixed = True
+
+    if not command_fixed:
         return
 
     updated_compose = "\n".join(new_lines)
@@ -67,7 +75,7 @@ def _fix_code_server_compose(conn) -> None:
         {"compose_template": updated_compose, "id": tool_id},
     )
 
-    print(f"Updated code-server tool type ({tool_id}) to bind to 0.0.0.0:8443")
+    print(f"Updated code-server tool type ({tool_id}) to bind to 0.0.0.0")
 
 
 def _fix_jupyter_compose(conn) -> None:
@@ -100,7 +108,9 @@ def _fix_jupyter_compose(conn) -> None:
             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')
+            new_lines.append(
+                f"{indent}command: start-notebook.sh --ip=0.0.0.0 --port=8888 --no-browser"
+            )
 
     if image_line_idx == -1:
         return