fix(installer): correct a false security claim, and clear the should-fix list

CLIENT IP / SPOOFABILITY. docs/geenforce-api-cutover.md claimed that removing the
IIS rewrite rule made the allowlist fail closed and that it does NOT become
spoofable. The opposite is true. IIS never sets X-Forwarded-For on its own; the
rule is the only thing that does. Remove it and IIS still forwards whatever
X-Forwarded-For the CALLER sent, waitress trusts it because it arrives from
127.0.0.1, and remote_addr becomes attacker-controlled - so a token-less caller
can fetch manifests from anywhere on the network. The document and the
_trusted_client_ip docstring now say so, waitress runs with
--trusted-proxy-count=1, and stage 5 checks the rule is actually live rather than
assuming it. The wizard question is rephrased to something an operator can verify
with their network team instead of guessing at.

NON-ASCII. The style gate only ever checked .py/.vue/.js/.ts, so documentation
accumulated em-dashes, arrows and box-drawing characters against this repo's own
convention - including in files added this week. Cleaned, and the gate now uses
INCLUDES_ALL so Markdown, JSON and YAML are covered.

PLUGIN DEFAULTS. The wizard pre-ticked measuringtools and printedparts, both of
which ship default_enabled=false, so every site taking the defaults installed and
enabled them against their manifests. Inno has no JSON parser so the list must be
hardcoded, but tests/test_installer_defaults.py now fails when it drifts.

UPGRADES. The payload copy merges, so a plugin dropped from a site's profile kept
its code forever - which defeats a lean build and leaves core's optional-import
guards succeeding for a plugin the site no longer has. Stale plugin directories
are now deregistered and removed before the copy.

add-plugin used 'plugin install', which for the five default_enabled=false
plugins left them installed but DISABLED - and printed a green success line
anyway. It now goes through apply-profile, and the success line is gated on the
exit code. Invoke-Flask records its own exit status, because $LASTEXITCODE keeps
a stale value when flask.exe is missing and no native command runs.

CHARSET. The utf8mb4 compiler hook lived inline in migrations/env.py, so it
covered the CORE chain only: plugin baselines inherited the server default, which
on a latin1 server means two charsets in one database. It is now
shopdb/utils/mysql_charset.py, imported by both, and preflight reports the
database's default charset.

BACKUP HONESTY. The dump was described as 'all of your asset data'. Uploaded
branding and floor-map images live in instance\ on disk, not in the database, so
a restore from the .sql alone comes back with no map. backup now archives
instance\ alongside it and says both are needed.

VERSIONING. AppVersion was hardcoded at 0.9.0 while the product, the frontend and
the newest tag said 0.7.0 - and 0.9.0 collides with a retired contract version.
Both builders now generate version.iss from shopdb/__init__.py.

Smaller: rollback overwrites .env before deleting it, as uninstall already did;
appcmd unlocks are scoped to this site's location rather than server-wide, with
the wide unlock as a fallback; DEVELOPMENT-SETUP says Python 3.14; the README
plugin list gains printedparts; prune-schema --force is documented as
first-provisioning-only; HTTPS is documented as not-the-default with the steps to
add it; the DBA SQL is on the wizard's database page; the features page says
unticking does not remove an installed feature; and the installer README states
that bundle-lock cannot vouch for the exe itself - that needs signing or an
out-of-band hash, neither of which is wired up.

tests/test_installer_defaults.py

@@ -0,0 +1,55 @@
+"""The installer wizard's pre-ticked feature list must match the plugin manifests.
+
+The wizard cannot read manifest.json - Inno's Pascal Script has no JSON parser -
+so the default set is a hardcoded list in ShopDBFlask.iss. It drifted: two plugins
+that ship "default_enabled": false were pre-ticked, so every site taking the
+defaults installed and enabled them against their own manifests.
+
+A hardcoded list is fine; a hardcoded list nobody checks is not.
+"""
+import json
+import re
+from pathlib import Path
+
+import pytest
+
+REPO = Path(__file__).resolve().parents[1]
+ISS = REPO / 'deploy' / 'windows' / 'installer' / 'ShopDBFlask.iss'
+PLUGINS = REPO / 'plugins'
+
+pytestmark = pytest.mark.skipif(not ISS.exists(), reason='installer not in this tree')
+
+
+def manifests_defaulting_off():
+    off = set()
+    for manifest in PLUGINS.glob('*/manifest.json'):
+        try:
+            data = json.loads(manifest.read_text())
+        except (ValueError, OSError):
+            continue
+        if data.get('default_enabled') is False:
+            off.add(manifest.parent.name)
+    return off
+
+
+def wizard_excludes():
+    """The names PluginDefault returns False for."""
+    body = re.search(r'function PluginDefault.*?\nend;', ISS.read_text(), re.S)
+    assert body, 'PluginDefault not found in ShopDBFlask.iss'
+    return set(re.findall(r"Name <> '([a-z_]+)'", body.group(0)))
+
+
+def test_wizard_defaults_match_the_manifests():
+    off = manifests_defaulting_off()
+    assert off, 'no plugin declares default_enabled false - has the field moved?'
+    assert wizard_excludes() == off, (
+        'ShopDBFlask.iss PluginDefault disagrees with the manifests.\n'
+        '  manifests default_enabled=false: %s\n'
+        '  wizard leaves unticked:          %s' % (sorted(off), sorted(wizard_excludes())))
+
+
+def test_every_wizard_exclusion_is_a_real_plugin():
+    """A typo in the .iss list silently pre-ticks the plugin it meant to exclude."""
+    for name in wizard_excludes():
+        assert (PLUGINS / name / 'manifest.json').exists(), (
+            '%s is excluded by the wizard but has no manifest' % name)