Delete cw_zano / cw_tron / cw_solana / cw_decred packages + all references

These chains were already disabled in availableWalletTypes (none of them
were getting created), but the source dirs and the codegen scaffolding
for them still lived in tree (~20K lines of dead Dart).

Surgery:
- Delete cw_decred/ cw_solana/ cw_tron/ cw_zano/ source trees
- Strip 5 generate*() function bodies from tool/configure.dart
  (generateSolana, generateTron, generateZano, generateDecred,
  generateZcash) plus their top-level imports, args, calls,
  signatures, and conditional pubspec/walletTypes injection blocks.
  configure.dart shrinks from 2134 to 1561 lines and dart analyze
  is clean.
- Strip solana/tron secrets config + output paths from
  tool/import_secrets_config.dart
- Delete scripts/{android,ios,macos}/build_decred.sh,
  scripts/ios/build_zano{,_all}.sh
- Patch scripts/{android,ios,macos}/build_all.sh,
  scripts/android/copy_monero_deps.sh, scripts/ios/setup.sh,
  scripts/ios/gen_framework.sh to drop decred/zano steps
- Patch scripts/android/docker/build.sh + Dockerfile.final to drop the
  decred Docker stage; delete scripts/android/docker/Dockerfile.decred
- Update .github/workflows/build-linux.yml comments to reflect the
  remaining cw_* module list (evm, nano, bitcoin)

Note: WalletType.{solana,tron,zano,decred,zcash} enum values still live
in cw_core/lib/wallet_type.dart and there are dead switch cases in
lib/di.dart and lib/new-ui/pages/*.dart that reference them. Those
paths are unreachable (the enum values never get assigned to any wallet)
but cleaning them up is a separate hygiene pass.

.github/workflows/build-linux.yml

@@ -50,9 +50,9 @@ jobs:
       # IMPORTANT: don't pre-write any of the tool/.*secrets-config.json
       # files. The generator at tool/generate_secrets_config.dart has an
       # early-return if tool/.secrets-config.json already exists (lines
-      # 57-63), which then ALSO skips creating the per-module configs (evm,
-      # solana, nano, tron, bitcoin) — every cw_* module then fails to
-      # compile with "Undefined name secrets.xxx" for dozens of keys.
+      # 57-63), which then ALSO skips creating the per-module configs
+      # (evm, nano, bitcoin) — every cw_* module then fails to compile
+      # with "Undefined name secrets.xxx" for dozens of keys.
       #
       # Instead: run the generator first so it creates all configs from the
       # full SecretKey list (with empty defaults), then sed-inject Trocador
@@ -93,7 +93,8 @@ jobs:
       # ---- Native crypto cores (monero_c prebuilt bundle) ------------------
       # Skips the full simplybs toolchain bootstrap. The bundle has libmonero,
       # libwownero, AND libzano .so files; CMake only installs the ones we
-      # ship (monero + wownero).
+      # ship (monero + wownero) — libzano is dropped at install time even
+      # though monero_c builds it.
       - name: Fetch prebuilt monero_c .so bundle
         run: |
           set -x -e