feat(cctv): FL511 Florida camera pack (stills, opt-in)

changelog.d/605-fl511-florida-cameras.md

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+- Add FL511 (Florida DOT) traffic cameras as an opt-in CCTV source pack:
+  the statewide ArcGIS catalog, read a page at a time under a byte cap with
+  redirects refused, and frames pinned to FL511's two image hosts over HTTPS.
+  FL511's terms limit its content to individual, non-commercial use, so the
+  pack stays off unless `CCTV_FLORIDA_ENABLED=1`. Headings come from the
+  catalog's direction codes, and camera ids come from the image channel, since
+  the catalog's ID column repeats across regions. `CCTV_FLORIDA_MAX_SOURCES`
+  sets the cap (Danielslay86, #605).