Cap request bodies, close a hole in the gate, fix to_dict and two settings pages

Six fixes that were ours regardless of what the sister site does. Four came out
of our own reviews; two you reported from the settings pages.

MAX_CONTENT_LENGTH was set nowhere. Every upload route caps its own payload, but
each of those checks runs after the body has arrived: the first touch of
request.form or request.files makes Werkzeug parse the whole multipart and spool
the file to a temp file, so a route can reject the content and still have paid
for the transfer and the disk. Three separate reviews found that shape in three
different routes, which makes it a property of the app rather than of any
handler. 128 MB, clearing the 64 MB agent binary with room for the envelope.

The naming gate excluded devnotes with --exclude-dir, which matches a directory
of that NAME at any depth - so a force-added plugins/<plugin>/devnotes/ was
invisible to every check in the file, ADR-015 included. Replaced with a path
anchored post-filter. Verified by planting the same site literal in root
devnotes/ AND in plugins/endpoints/devnotes/: the gate now reports exactly one,
the nested one. Before, it reported none.

BaseModel.to_dict walked __table__.columns and published every one, so a model
without an override published whatever it carried - including columns added
later by someone not thinking about this method. User has no override, so
User.to_dict() returned its bcrypt hash. Nothing calls it in a response path
today, which is luck rather than design. A blanket allowlist would empty the
output of all 34 models relying on the default, so this pins a floor instead:
named secret-bearing columns are never emitted, and a model may extend the set.
Eight tests, including a sweep over every mapped model.

ActionPicker's Esc handlers had .prevent but not .stop, so the event bubbled to
the wrapper and closed the whole picker instead of returning to the monitor list.

The branding page reported "error loading image" on the site and badge logos.
Two bugs stacked. The load failure was real: the preview used the stored value
as a raw src, and that value is root-relative, so under /shopdb or /ops it
resolved against the SERVER root and 404d - siteSettings.js wraps every logo in
withBase() and this page was the one place that did not. With that fixed two of
three were still invisible, because the shipped GE mark is fill="white" for the
dark sidebar and was rendering white-on-white. The preview tile now sits on a
mid-tone checker so artwork of any colour reads against it.

The floor-map levels table ran off the right with its cells crushed - nine
columns of inputs, no scroll wrapper, and .data-table is styled nowhere. My
first attempt reached for the global .table-container and made it WORSE: that
class also sets white-space: nowrap, and a full sentence of hint text lives in
one of the cells, so nowrap forced the table wider still. It now scrolls in a
local wrapper, the hint wraps, and the name input has a width instead of
collapsing to one character.

Suite 2377, frontend 324, gate green.

Scope: product

scripts/check-naming-and-style.sh

@@ -35,12 +35,18 @@ EXCLUDES=(
     --exclude-dir=.git
     --exclude-dir=versions
     --exclude-dir=staticdocs
-    # Local, gitignored scratch notes (see .gitignore devnotes/). Not product
-    # source, never committed, and free to hold pasted logs full of em-dashes
-    # and arrows - grep does not consult .gitignore, so exclude it explicitly.
-    --exclude-dir=devnotes
 )
 
+# Root-level gitignored scratch: review writeups and chat handoffs, free to hold
+# pasted logs full of em-dashes and arrows. grep does not consult .gitignore, so
+# it has to be dropped here.
+#
+# A POST-FILTER, not --exclude-dir=devnotes. That flag matches a directory of
+# that NAME at any depth, so a force-added plugins/<plugin>/devnotes/ would be
+# invisible to every check in this file, ADR-015 included - a hole in the gate
+# that nothing would report. This drops only the path we mean.
+drop_scratch() { grep -v '^\./devnotes/' || true; }
+
 INCLUDES_CODE=(
     --include='*.py'
     --include='*.vue'
@@ -64,7 +70,7 @@ INCLUDES_ALL=(
 # and did, including in files this repo's own convention forbids them in.
 # Markdown, JSON and YAML are now covered too.
 echo "==> Checking for non-ASCII characters..."
-NON_ASCII=$(grep -rPn '[^\x00-\x7F]' "${EXCLUDES[@]}" "${INCLUDES_ALL[@]}" . 2>/dev/null || true)
+NON_ASCII=$(grep -rPn '[^\x00-\x7F]' "${EXCLUDES[@]}" "${INCLUDES_ALL[@]}" . 2>/dev/null | drop_scratch || true)
 if [ -n "$NON_ASCII" ]; then
     echo "FAIL: non-ASCII characters found (em-dashes, smart quotes, arrows, emojis):"
     echo "$NON_ASCII"
@@ -89,7 +95,7 @@ for word in cfg ctx mgr req res; do
 done
 
 echo "==> Checking for snake_case DB tablenames..."
-SNAKE_TABLES=$(grep -rPn "__tablename__\s*=\s*['\"][^'\"]*_" "${EXCLUDES[@]}" --include='*.py' . 2>/dev/null || true)
+SNAKE_TABLES=$(grep -rPn "__tablename__\s*=\s*['\"][^'\"]*_" "${EXCLUDES[@]}" --include='*.py' . 2>/dev/null | drop_scratch || true)
 if [ -n "$SNAKE_TABLES" ]; then
     echo "FAIL: snake_case __tablename__ found (must be lowercase concatenated):"
     echo "$SNAKE_TABLES"
@@ -98,7 +104,7 @@ if [ -n "$SNAKE_TABLES" ]; then
 fi
 
 echo "==> Checking for snake_case DB column attrs..."
-SNAKE_COLS=$(grep -rPn "^\s+[a-z]+_[a-z_]+\s*=\s*db\.Column" "${EXCLUDES[@]}" --include='*.py' . 2>/dev/null || true)
+SNAKE_COLS=$(grep -rPn "^\s+[a-z]+_[a-z_]+\s*=\s*db\.Column" "${EXCLUDES[@]}" --include='*.py' . 2>/dev/null | drop_scratch || true)
 if [ -n "$SNAKE_COLS" ]; then
     echo "FAIL: snake_case db.Column attribute found (must match column name, no underscores):"
     echo "$SNAKE_COLS"
@@ -107,7 +113,7 @@ if [ -n "$SNAKE_COLS" ]; then
 fi
 
 echo "==> Checking for snake_case ForeignKey targets..."
-SNAKE_FK=$(grep -rPn "ForeignKey\(['\"][^'\"]*_[^'\"]*['\"]" "${EXCLUDES[@]}" --include='*.py' . 2>/dev/null || true)
+SNAKE_FK=$(grep -rPn "ForeignKey\(['\"][^'\"]*_[^'\"]*['\"]" "${EXCLUDES[@]}" --include='*.py' . 2>/dev/null | drop_scratch || true)
 if [ -n "$SNAKE_FK" ]; then
     echo "FAIL: snake_case ForeignKey target found:"
     echo "$SNAKE_FK"
@@ -116,7 +122,7 @@ if [ -n "$SNAKE_FK" ]; then
 fi
 
 echo "==> Checking for snake_case API params in frontend (DB-mirrored fields)..."
-SNAKE_FE=$(grep -rPn "params\.(machine_id|location_id|vendor_id|type_id|business_unit_id|model_id|status_id|operating_system_id|asset_id|user_id|is_active|is_shopfloor)" "${EXCLUDES[@]}" --include='*.vue' --include='*.js' --include='*.ts' . 2>/dev/null || true)
+SNAKE_FE=$(grep -rPn "params\.(machine_id|location_id|vendor_id|type_id|business_unit_id|model_id|status_id|operating_system_id|asset_id|user_id|is_active|is_shopfloor)" "${EXCLUDES[@]}" --include='*.vue' --include='*.js' --include='*.ts' . 2>/dev/null | drop_scratch || true)
 if [ -n "$SNAKE_FE" ]; then
     echo "FAIL: snake_case API params in frontend (must match DB column names without underscores):"
     echo "$SNAKE_FE"