Support multiple cwd filters for thread list (#18502)

## Summary

- Teach app-server `thread/list` to accept either a single `cwd` or an
array of cwd filters, returning threads whose recorded session cwd
matches any requested path
- Add `useStateDbOnly` as an explicit opt-in fast path for callers that
want to answer `thread/list` from SQLite without scanning JSONL rollout
files
- Preserve backwards compatibility: by default, `thread/list` still
scans JSONL rollouts and repairs SQLite state
- Wire the new cwd array and SQLite-only options through app-server,
local/remote thread-store, rollout listing, generated TypeScript/schema
fixtures, proto output, and docs

## Test Plan

- `cargo test -p codex-app-server-protocol`
- `cargo test -p codex-rollout`
- `cargo test -p codex-thread-store`
- `cargo test -p codex-app-server thread_list`
- `just fmt`
- `just fix -p codex-app-server-protocol -p codex-rollout -p
codex-thread-store -p codex-app-server`
- `cargo build -p codex-cli --bin codex`

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json

@@ -14868,6 +14868,19 @@
           }
         ]
       },
+      "ThreadListCwdFilter": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          }
+        ]
+      },
       "ThreadListParams": {
         "$schema": "http://json-schema.org/draft-07/schema#",
         "properties": {
@@ -14886,11 +14899,15 @@
             ]
           },
           "cwd": {
-            "description": "Optional cwd filter; when set, only threads whose session cwd exactly matches this path are returned.",
-            "type": [
-              "string",
-              "null"
-            ]
+            "anyOf": [
+              {
+                "$ref": "#/definitions/v2/ThreadListCwdFilter"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Optional cwd filter or filters; when set, only threads whose session cwd exactly matches one of these paths are returned."
           },
           "limit": {
             "description": "Optional page size; defaults to a reasonable server-side value.",
@@ -14949,6 +14966,10 @@
               "array",
               "null"
             ]
+          },
+          "useStateDbOnly": {
+            "description": "If true, return from the state DB without scanning JSONL rollouts to repair thread metadata. Omitted or false preserves scan-and-repair behavior.",
+            "type": "boolean"
           }
         },
         "title": "ThreadListParams",