Add the ihasmail template for Unraid Community Applications

One XML per app under templates/, ca_profile.xml at the root, as the
Community Applications starter lays it out.

The ihasmail template runs the published multi-arch image read-only
with /tmp in memory, and as Unraid's nobody user (99:100) because that
is the owner Unraid gives a freshly created appdata folder; the image's
own user could not write the session file there. The appdata path is
optional: clear it, blank SESSION_FILE and set IMMUTABLE=1 for a
container with no writable path at all.

LICENSE

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+MIT License
+
+Copyright (c) 2026 Coffey Labs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.