feat(ml): detector config in MLSettings with working defaults (#134 step 1)

Move the crop-proposer config (per-proposer enable + weights + conf, caps,
dedupe IoU) into the DB so it's UI-tunable and can be announced to the GPU agent
in the lease (like the embedder model) — no restart, agent env becomes
bootstrap-only. Migration 0078 adds the columns with working server_defaults so
existing rows + fresh installs crop out-of-the-box with all three proposers ON
(operator: default-on): person=yolo11n.pt, anatomy=booru_yolo yolov11m_aa22 (URL,
license unstated/private-homelab-OK), panel=mosesb best.pt. Plain columns, no
CHECK enum. Steps 2 (lease announce + agent apply) and 3 (Settings UI) follow.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

alembic/versions/0078_ml_settings_detectors.py

@@ -0,0 +1,83 @@
+"""ml_settings crop-proposer / detector config (#134)
+
+Move the WHERE-to-crop detector config (per-proposer enable + weights + conf,
+plus caps + dedupe IoU) into the DB so it's UI-tunable and announced to the GPU
+agent in the lease (like the embedder model) — no restart, agent env is now
+bootstrap-only. All server_defaults are the working values so existing rows +
+fresh installs crop out-of-the-box with all three proposers ON.
+
+Revision ID: 0078
+Revises: 0077
+Create Date: 2026-07-05
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0078"
+down_revision: Union[str, None] = "0077"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+_ANATOMY_DEFAULT = (
+    "https://github.com/aperveyev/booru_yolo/raw/main/models/yolov11m_aa22.pt"
+)
+_PANEL_DEFAULT = "mosesb/best-comic-panel-detection::best.pt"
+
+
+def upgrade() -> None:
+    op.add_column("ml_settings", sa.Column(
+        "detector_person_enabled", sa.Boolean(), nullable=False,
+        server_default=sa.true()))
+    op.add_column("ml_settings", sa.Column(
+        "detector_person_weights", sa.String(512), nullable=False,
+        server_default="yolo11n.pt"))
+    op.add_column("ml_settings", sa.Column(
+        "detector_person_conf", sa.Float(), nullable=False,
+        server_default=sa.text("0.35")))
+    op.add_column("ml_settings", sa.Column(
+        "detector_anatomy_enabled", sa.Boolean(), nullable=False,
+        server_default=sa.true()))
+    op.add_column("ml_settings", sa.Column(
+        "detector_anatomy_weights", sa.String(512), nullable=False,
+        server_default=_ANATOMY_DEFAULT))
+    op.add_column("ml_settings", sa.Column(
+        "detector_anatomy_conf", sa.Float(), nullable=False,
+        server_default=sa.text("0.30")))
+    op.add_column("ml_settings", sa.Column(
+        "detector_panel_enabled", sa.Boolean(), nullable=False,
+        server_default=sa.true()))
+    op.add_column("ml_settings", sa.Column(
+        "detector_panel_weights", sa.String(512), nullable=False,
+        server_default=_PANEL_DEFAULT))
+    op.add_column("ml_settings", sa.Column(
+        "detector_panel_conf", sa.Float(), nullable=False,
+        server_default=sa.text("0.30")))
+    op.add_column("ml_settings", sa.Column(
+        "detector_max_figures", sa.Integer(), nullable=False,
+        server_default=sa.text("8")))
+    op.add_column("ml_settings", sa.Column(
+        "detector_max_components", sa.Integer(), nullable=False,
+        server_default=sa.text("8")))
+    op.add_column("ml_settings", sa.Column(
+        "detector_max_panels", sa.Integer(), nullable=False,
+        server_default=sa.text("8")))
+    op.add_column("ml_settings", sa.Column(
+        "detector_max_regions", sa.Integer(), nullable=False,
+        server_default=sa.text("128")))
+    op.add_column("ml_settings", sa.Column(
+        "detector_dedupe_iou", sa.Float(), nullable=False,
+        server_default=sa.text("0.85")))
+
+
+def downgrade() -> None:
+    for col in (
+        "detector_person_enabled", "detector_person_weights", "detector_person_conf",
+        "detector_anatomy_enabled", "detector_anatomy_weights", "detector_anatomy_conf",
+        "detector_panel_enabled", "detector_panel_weights", "detector_panel_conf",
+        "detector_max_figures", "detector_max_components", "detector_max_panels",
+        "detector_max_regions", "detector_dedupe_iou",
+    ):
+        op.drop_column("ml_settings", col)