feat: add descriptive model naming and inline rename

- Auto-generate model names: {arch}-{labelType}-{epochs}ep-{classNames}-{YYYYMMDD}
- Add PATCH /api/models/{id}/rename endpoint
- Inline rename UI on Models & Training page
- Download filename uses model name instead of v{N}
- DB migration: add name column to model_versions
- Update all docs to reflect new naming convention

backend/training.py

@@ -12,6 +12,21 @@ import shutil
 import time
 from typing import Optional
 
+
+def _generate_model_name(project: dict, start_point: str, epochs: int,
+                         class_ids: Optional[list] = None) -> str:
+    """Build a descriptive model name: arch-labelType-epochs-classNames-YYYYMMDD."""
+    arch = os.path.splitext(os.path.basename(start_point))[0]
+
+    # Filter classes if specific IDs were selected.
+    classes = project["classes"]
+    if class_ids:
+        classes = [c for c in classes if c["class_id"] in class_ids]
+    class_tag = "+".join(c["name"] for c in classes) or "unknown"
+
+    date_str = time.strftime("%Y%m%d", time.localtime())
+    return f"{arch}-{project['label_type']}-{epochs}ep-{class_tag}-{date_str}"
+
 from backend import (augment, base_dataset, config, dataset, datasets, db, evaluate,
                      hardware, jobs, projects)
 
@@ -149,6 +164,16 @@ def promote(model_id: int) -> dict:
     return projects.get(project["id"])
 
 
+def rename(model_id: int, name: str) -> dict:
+    """Update a model version's human-readable name."""
+    version = get_version(model_id)
+    if version is None:
+        raise TrainingError("No such model version")
+    with db.cursor() as cur:
+        cur.execute("UPDATE model_versions SET name = ? WHERE id = ?", (name.strip(), model_id))
+    return get_version(model_id)
+
+
 def _next_version(cur, project_id: int) -> int:
     cur.execute(
         "SELECT COALESCE(MAX(version), 0) + 1 FROM model_versions WHERE project_id = ?",
@@ -262,11 +287,12 @@ def _run_train(job) -> None:
             cur.execute(
                 """INSERT INTO model_versions (project_id, version, weights_path,
                                                parent_model_path, metrics, base_metrics,
-                                               created_at, augment)
-                   VALUES (?, ?, ?, ?, ?, ?, ?, ?)""",
+                                               created_at, augment, name)
+                   VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)""",
                 (project["id"], version, weights, project["base_model_path"],
                  json.dumps(comparison["new"]), json.dumps(comparison["base"]), time.time(),
-                 json.dumps(augmentation["settings"])),
+                 json.dumps(augmentation["settings"]),
+                 _generate_model_name(project, start_point, settings["epochs"], class_ids)),
             )
 
         new = comparison["new"]