feat(logging): implement configurable log levels via VITE_LOG_LEVEL

Add comprehensive logging configuration system with environment variable support.
Environment files now include appropriate log levels per build mode:
- Development: debug (maximum visibility)
- Production: warn (minimal noise)
- Testing: info (balanced output)

Includes smart default behavior based on platform and environment,
enhanced logger methods for level checking, and comprehensive documentation.
All existing logging calls remain backward compatible.

Closes logging configuration request

.env.development

@@ -1,10 +1,14 @@
-
 # Only the variables that start with VITE_ are seen in the application import.meta.env in Vue.
 
+# Logging Configuration - Development environment gets maximum visibility
+VITE_LOG_LEVEL=debug
+
 # iOS doesn't like spaces in the app title.
 TIME_SAFARI_APP_TITLE="TimeSafari_Dev"
 VITE_APP_SERVER=http://localhost:8080
-# This is the claim ID for actions in the BVC project, with the JWT ID on this environment (not production).
+# This is the claim ID for actions in the BVC project, with the JWT ID on this environment (not
+ production).
+
 VITE_BVC_MEETUPS_PROJECT_CLAIM_ID=https://endorser.ch/entity/01HWE8FWHQ1YGP7GFZYYPS272F
 VITE_DEFAULT_ENDORSER_API_SERVER=http://localhost:3000
 # Using shared server by default to ease setup, which works for shared test users.