Read personal dev settings from git-ignored local config

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/dev.env.example

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+# Personal settings of the dev tools in tools/. Copy to local/dev.env (the whole local/ is git-ignored) and fill in.
+# Plain KEY=value lines, no quotes and no $expansion: the shell scripts and the Python ones both read this file.
+# A variable already set in the environment wins over the file.
+
+# JDK 21 for Gradle and the desktop app (otherwise the JAVA_HOME of the environment, or java on PATH).
+#JAVA_HOME=/path/to/jdk-21
+# adb of the Android SDK (otherwise adb on PATH, or ~/Android/Sdk/platform-tools/adb).
+#ADB=/path/to/Android/Sdk/platform-tools/adb
+
+# The test TV for tools/tv/env.sh: adb address ip:port (classic adb over TCP is :5555; the port of
+# «Беспроводная отладка» changes after a reboot).
+TV_ADB=
+# Jellyfin server the tools talk to, by its LAN address, e.g. http://192.168.1.10:8096.
+JF_URL=
+# Test account on that server. Test runs change its watch state; tools/linux/watchdata.py puts it back.
+JF_USER=
+
+# Series id for the baseline-profile walk over a series page (gen_profile in tools/tv/env.sh).
+PROFILE_SERIES=
+# Three consecutive episodes of one season, space-separated ids (S1E2 S1E3 S1E4), for tools/linux/k2.py.
+K2_EPISODES=
+# Any 1080p video item for tools/linux/l0/float_test.py.
+L0_FLOAT_ITEM=
+# Test cases of tools/linux/l0/run_all.sh, relative to the repo root: lines "<name> <itemId> [run_case.py options]".
+L0_CASES=local/l0-cases.txt