Merge branch '3.1' into fix/duplicate-device-configs-merge

Resolve conflicts against the upstream wave (PRs #2952-#2965, incl. the
typed-response/schema hardening and the drop of Python 3.10):

- controller/node.py: keep upstream's _transitioning/_confirm_status
  lifecycle guard; the kernel-anchor link wiring (node_started) runs
  after the transition completes.
- controller/link.py: keep upstream's add_node rollback (release_ports
  on create failure) and delete via release_ports; release_ports now
  resolves ports live (same staleness reason as _bind_members) and
  discards the node link unconditionally.
- schemas/controller/links.py: extend LinkFilterType with the eight
  kernel-datapath filter types and LinkFilterParameter.type with "str"
  so the newly typed /available_filters response validates; Link.filters
  stays a free-form dict — the vocabulary is capability-gated per link
  and validated by the controller (409), not by a strict request schema.
- schemas/controller/topology.py: drop the type: ignore made redundant
  by the dict filters field.
- tests: route-level filter validation now expects the controller's 409
  (unknown types, out-of-range values); packet_loss correlation is a
  valid kernel parameter (positive test added); OpenAPI assertions match
  the free-form filters property.

gns3server/compute/base_node.py

@@ -671,11 +671,7 @@ class BaseNode:
                 )
 
         # keep forwarding websocket data in both direction
-        if sys.version_info >= (3, 11, 0):
-            # Starting with Python 3.11, passing coroutine objects to wait() directly is forbidden.
-            aws = [asyncio.create_task(ws_forward(telnet_writer)), asyncio.create_task(telnet_forward(telnet_reader))]
-        else:
-            aws = [ws_forward(telnet_writer), telnet_forward(telnet_reader)]
+        aws = [asyncio.create_task(ws_forward(telnet_writer)), asyncio.create_task(telnet_forward(telnet_reader))]
 
         done, pending = await asyncio.wait(aws, return_when=asyncio.FIRST_COMPLETED)
         for task in done:
@@ -762,11 +758,7 @@ class BaseNode:
                 log.warning(f"Exception while forwarding VNC data to WebSocket: {e!r}")
 
         # Keep forwarding WebSocket data in both directions
-        if sys.version_info >= (3, 11, 0):
-            # Starting with Python 3.11, passing coroutine objects to wait() directly is forbidden.
-            aws = [asyncio.create_task(ws_forward(vnc_writer)), asyncio.create_task(vnc_forward(vnc_reader))]
-        else:
-            aws = [ws_forward(vnc_writer), vnc_forward(vnc_reader)]
+        aws = [asyncio.create_task(ws_forward(vnc_writer)), asyncio.create_task(vnc_forward(vnc_reader))]
 
         done, pending = await asyncio.wait(aws, return_when=asyncio.FIRST_COMPLETED)
         for task in done:

gns3server/compute/project.py

@@ -480,11 +480,13 @@ class Project:
                 stat_info = await wait_run_in_executor(lambda e=entry: e.stat())
                 is_dir = await wait_run_in_executor(lambda e=entry: e.is_dir())
                 if is_dir:
+                    created_at: str | None = None
+                    modified_at: str | None = None
                     try:
                         created_at = datetime.datetime.fromtimestamp(stat_info.st_ctime).isoformat()
                         modified_at = datetime.datetime.fromtimestamp(stat_info.st_mtime).isoformat()
                     except (OSError, OverflowError, ValueError):
-                        created_at = modified_at = ""
+                        created_at = modified_at = None
                     files.append(
                         {
                             "path": rel_path,
@@ -506,7 +508,7 @@ class Project:
                         created_at = datetime.datetime.fromtimestamp(stat_info.st_ctime).isoformat()
                         modified_at = datetime.datetime.fromtimestamp(stat_info.st_mtime).isoformat()
                     except (OSError, OverflowError, ValueError):
-                        created_at = modified_at = ""
+                        created_at = modified_at = None
                     files.append(
                         {
                             "path": rel_path,
@@ -537,7 +539,7 @@ class Project:
                         created_at = datetime.datetime.fromtimestamp(stat_info.st_ctime).isoformat()
                         modified_at = datetime.datetime.fromtimestamp(stat_info.st_mtime).isoformat()
                     except (OSError, OverflowError, ValueError):
-                        created_at = modified_at = ""
+                        created_at = modified_at = None
                     files.append(
                         {
                             "path": os.path.relpath(dir_full_path, base_path),
@@ -567,7 +569,7 @@ class Project:
                         modified_at = datetime.datetime.fromtimestamp(stat_info.st_mtime).isoformat()
                     except (OSError, OverflowError, ValueError) as e:
                         log.warning(f"Invalid timestamp for '{rel_path}': {e}")
-                        created_at = modified_at = ""
+                        created_at = modified_at = None
                     files.append(
                         {
                             "path": rel_path,