fix(bicep): support multi-line array completion for roles and other enums

Adds support for autocomplete in multi-line array syntax like:

    roles: [
      'KEY_VAULT_  ← cursor triggers completion here
    ]

Previously only worked on same line as opening bracket:
    roles: ['KEY_VAULT_  ← only this worked

Changes:
- Walk backwards up to 10 lines to find array opening (e.g. "roles: [")
- Detect if cursor is inside array based on indentation and quotes
- Stop lookback if closing bracket found (not in array anymore)
- Add test case for nested multi-line array completion
- Improve lsp_bridge.py error handling with traceback logging
- Add lsp_bridge_debug.sh wrapper for easier IntelliJ debugging
- Update EDITOR_SETUP.md with correct IntelliJ LSP4IJ config

Fixes autocomplete for deeply nested structures like:
    assignments: [{ roles: ['APP_CONFIGURATION_...'] }]

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test_proxy.py

@@ -329,6 +329,30 @@ def test_detect_param_value_context_in_array():
     assert ctx["has_open_quote"] is True
 
 
+def test_detect_param_value_context_in_multiline_array():
+    """Cursor in multi-line array element → param_value context."""
+    lines = [
+        "module myMod 'br/modules:roleassignments:2.0.x' = {",
+        "  params: {",
+        "    assignments: [",
+        "      {",
+        "        roles: [",
+        "          'APP_CONFIGURATION_",  # ← cursor on separate line
+        "        ]",
+        "      }",
+        "    ]",
+        "  }",
+        "}",
+    ]
+    session = _make_session_with_doc(URI, lines)
+    # character = len("          'APP_CONFIGURATION_") = 27
+    ctx = session._detect_context(URI, {"line": 5, "character": 27})
+    assert ctx["type"] == "param_value"
+    assert ctx["module"] == "roleassignments"
+    assert ctx["param"] == "roles"
+    assert ctx["has_open_quote"] is True
+
+
 def test_param_value_items_from_catalog_allowed():
     """environmentType completions come from catalog 'allowed' field."""
     BicepModuleCatalog._modules = [_make_module(