[AZ-501] [AZ-502] Cycle 2 Step 14 security audit + inline fixes

Security audit (5 phases) → reports under _docs/05_security/.

AZ-501 (F-SAST-1, HIGH): Externalize hardcoded Google Geocode key
from mission-planner/src/config.ts to VITE_GOOGLE_GEOCODE_KEY via
new GeocodeService.ts; fail-soft warn when unset; STC-SEC1D static
deny-list gate; +5 unit tests in tests/mission_planner_geocode.test.ts.

AZ-502 (F-DEP-1, HIGH): Force vite>=6.4.2 and postcss>=8.5.10 via
package.json overrides in both roots; clean reinstall clears all
bun audit advisories.

Test-spec sync (Step 12) + Update Docs (Step 13) deltas: AC-43, AC-44,
NFT-SEC-09b, FT-P-61, FT-N-17, ripple log, batch_12 report.

Pending user actions: revoke Google + OWM keys (AC-6 / AZ-499 AC-7).

229 PASS / 13 SKIP / 0 FAIL on static + fast suites.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/check-banned-deps.mjs

@@ -199,7 +199,8 @@ function main() {
     kind === 'legacy_integrations' ||
     kind === 'concurrent_edit_patterns' ||
     kind === 'alert_calls' ||
-    kind === 'owm_key_in_source'
+    kind === 'owm_key_in_source' ||
+    kind === 'google_key_in_source'
   ) {
     hits = checkSourceTree(section, root, ['src', 'mission-planner'])
   } else if (kind === 'destructive_surfaces') {